v14i078: ephem, 3 of 6
downey at cs.umn.edu
downey at cs.umn.edu
Fri Aug 31 10:54:25 AEST 1990
Posting-number: Volume 14, Issue 78
Submitted-by: downey at cs.umn.edu@dimed1.UUCP
Archive-name: ephem-4.21/part03
#! /bin/sh
# This is a shell archive. Remove anything before this line, then unpack
# it by saving it into a file and typing "sh file". To overwrite existing
# files, type "sh file -c". You can also feed this as standard input via
# unshar, or by typing "sh <file", e.g.. If this archive is complete, you
# will see the following message at the end:
# "End of archive 3 (of 6)."
# Contents: altmenus.c circum.c ephem.db plot.c version.c
# Wrapped by allbery at uunet on Thu Aug 30 20:46:33 1990
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f 'altmenus.c' -a "${1}" != "-c" ; then
echo shar: Will not clobber existing file \"'altmenus.c'\"
else
echo shar: Extracting \"'altmenus.c'\" \(10867 characters\)
sed "s/^X//" >'altmenus.c' <<'END_OF_FILE'
X/* printing routines for the three alternative bottom half menus,
X * "menu1", "menu2" and "menu3".
X */
X
X#include <stdio.h>
X#include <math.h>
X#include "astro.h"
X#include "circum.h"
X#include "screen.h"
X
Xstatic int altmenu = F_MNU1; /* which alternate menu is up; one of F_MNUi */
Xstatic int alt2_stdhzn; /* whether to use STDHZN (aot ADPHZN) horizon algthm */
Xstatic int alt3_geoc; /* whether to use geocentric (aot topocentric) vantage*/
X
X/* table of screen rows given a body #define from astro/h or screen.h */
Xstatic short bodyrow[NOBJ] = {
X R_MERCURY, R_VENUS, R_MARS, R_JUPITER, R_SATURN,
X R_URANUS, R_NEPTUNE, R_PLUTO, R_SUN, R_MOON, R_OBJX, R_OBJY
X};
X/* table of screen cols for third menu format, given body #define ... */
Xstatic short bodycol[NOBJ] = {
X C_MERCURY, C_VENUS, C_MARS, C_JUPITER, C_SATURN,
X C_URANUS, C_NEPTUNE, C_PLUTO, C_SUN, C_MOON, C_OBJX, C_OBJY
X};
X
X/* initialize altmenu; used by main from cracking the ephem startup file.
X */
Xaltmenu_init (n)
Xint n;
X{
X altmenu = n;
X}
X
X/* let op decide which alternate menu should be up,
X * including any menu-specific setup they might require.
X * return 0 if things changed to require updating the alt menu; else -1.
X */
Xaltmenu_setup()
X{
X static char *flds[5] = {
X "Data menu", "Rise/Set menu", "Separations menu"
X };
X int newmenu = altmenu, newhzn = alt2_stdhzn, newgeoc = alt3_geoc;
X int new;
X int fn = altmenu == F_MNU1 ? 0 : altmenu == F_MNU2 ? 1 : 2;
X
X ask:
X flds[3]= newhzn ? "Standard hzn" : "Adaptive hzn";
X flds[4]= newgeoc? "Geocentric" : "Topocentric";
X
X switch (popup (flds, fn, 5)) {
X case 0: newmenu = F_MNU1; break;
X case 1: newmenu = F_MNU2; break;
X case 2: newmenu = F_MNU3; break;
X case 3: newhzn ^= 1; fn = 3; goto ask;
X case 4: newgeoc ^= 1; fn = 4; goto ask;
X default: return (-1);
X }
X
X new = 0;
X if (newmenu != altmenu) {
X altmenu = newmenu;
X new++;
X }
X if (newhzn != alt2_stdhzn) {
X alt2_stdhzn = newhzn;
X if (newmenu == F_MNU2)
X new++;
X }
X if (newgeoc != alt3_geoc) {
X alt3_geoc = newgeoc;
X if (newmenu == F_MNU3)
X new++;
X }
X return (new ? 0 : -1);
X}
X
X/* erase the info for the given planet */
Xalt_nobody (p)
Xint p;
X{
X f_eol (bodyrow[p], C_RA);
X}
X
Xalt_body (b, force, np)
Xint b; /* which body, ala astro.h and screen.h defines */
Xint force; /* if !0 then draw for sure, else just if changed since last */
XNow *np;
X{
X switch (altmenu) {
X case F_MNU1: alt1_body (b, force, np); break;
X case F_MNU2: alt2_body (b, force, np); break;
X case F_MNU3: alt3_body (b, force, np); break;
X }
X}
X
X/* draw the labels for the current alternate menu format */
Xalt_labels ()
X{
X switch (altmenu) {
X case F_MNU1: alt1_labels (); break;
X case F_MNU2: alt2_labels (); break;
X case F_MNU3: alt3_labels (); break;
X }
X}
X
X/* erase the labels for the current alternate menu format */
Xalt_nolabels ()
X{
X int i;
X
X f_string (R_ALTM, C_ALTMV, " ");
X for (i = R_PLANTAB; i < R_SUN; i++)
X f_eol (i, C_RA);
X}
X
Xalt_menumask()
X{
X return (altmenu);
X}
X
X/* handy function to return the next planet in the order in which they are
X * displayed in the lower half of the screen.
X * input is a given planet, return is the next planet.
X * if input is not legal, then first planet is returned; when input is the
X * last planet, then -1 is returned.
X * typical usage is something like:
X * for (p = nxtbody(-1); p != -1; p = nxtbody(p))
X */
Xnxtbody(p)
Xint p;
X{
X static short nxtpl[NOBJ] = {
X VENUS, MARS, JUPITER, SATURN, URANUS,
X NEPTUNE, PLUTO, OBJX, MOON, MERCURY, OBJY, -1
X };
X
X if (p < MERCURY || p >= NOBJ)
X return (SUN);
X else
X return (nxtpl[p]);
X}
X
Xstatic
Xalt1_labels()
X{
X f_string (R_ALTM, C_ALTMV, " Planet Data");
X
X f_string (R_PLANTAB, C_RA+2, "R.A.");
X f_string (R_PLANTAB, C_DEC+2,"Dec");
X f_string (R_PLANTAB, C_AZ+2, "Az");
X f_string (R_PLANTAB, C_ALT+2,"Alt");
X f_string (R_PLANTAB, C_HLONG,"H Long");
X f_string (R_PLANTAB, C_HLAT, "H Lat");
X f_string (R_PLANTAB, C_EDIST,"Ea Dst");
X f_string (R_PLANTAB, C_SDIST,"Sn Dst");
X f_string (R_PLANTAB, C_ELONG,"Elong");
X f_string (R_PLANTAB, C_SIZE, "Size");
X f_string (R_PLANTAB, C_MAG, "VMag");
X f_string (R_PLANTAB, C_PHASE,"Phs");
X}
X
Xstatic
Xalt2_labels()
X{
X f_string (R_ALTM, C_ALTMV, "Rise/Set Info");
X
X f_string (R_PLANTAB, C_RISETM-2, "Rise Time");
X f_string (R_PLANTAB, C_RISEAZ, "Rise Az");
X f_string (R_PLANTAB, C_TRANSTM-2, "Trans Time");
X f_string (R_PLANTAB, C_TRANSALT-1, "Trans Alt");
X f_string (R_PLANTAB, C_SETTM-1, "Set Time");
X f_string (R_PLANTAB, C_SETAZ, "Set Az");
X f_string (R_PLANTAB, C_TUP-1, "Hours Up");
X}
X
Xstatic
Xalt3_labels()
X{
X f_string (R_ALTM, C_ALTMV, " Separations");
X
X f_string (R_PLANTAB, C_SUN, " Sun");
X f_string (R_PLANTAB, C_MOON, "Moon");
X f_string (R_PLANTAB, C_MERCURY, "Merc");
X f_string (R_PLANTAB, C_VENUS, "Venus");
X f_string (R_PLANTAB, C_MARS, "Mars");
X f_string (R_PLANTAB, C_JUPITER, " Jup");
X f_string (R_PLANTAB, C_SATURN, " Sat");
X f_string (R_PLANTAB, C_URANUS, "Uranus");
X f_string (R_PLANTAB, C_NEPTUNE, " Nep");
X f_string (R_PLANTAB, C_PLUTO, "Pluto");
X f_string (R_PLANTAB, C_OBJX, " X");
X f_string (R_PLANTAB, C_OBJY, " Y");
X}
X
X/* print body info in first menu format */
Xstatic
Xalt1_body (p, force, np)
Xint p; /* which body, as in astro.h/screen.h defines */
Xint force; /* whether to print for sure or only if things have changed */
XNow *np;
X{
X Sky sky;
X double as = plot_ison() || srch_ison() ? 0.0 : 60.0;
X int row = bodyrow[p];
X
X if (body_cir (p, as, np, &sky) || force) {
X f_ra (row, C_RA, sky.s_ra);
X f_angle (row, C_DEC, sky.s_dec);
X if (sky.s_hlong != NOHELIO) {
X f_angle (row, C_HLONG, sky.s_hlong);
X if (p != SUN)
X f_angle (row, C_HLAT, sky.s_hlat);
X }
X
X if (p == MOON) {
X /* distance is on km, show in miles */
X f_double (R_MOON, C_EDIST, "%6.0f", sky.s_edist/1.609344);
X } else if (sky.s_edist > 0.0) {
X /* show distance in au */
X f_double (row, C_EDIST,(sky.s_edist>=10.0)?"%6.3f":"%6.4f",
X sky.s_edist);
X }
X if (sky.s_sdist > 0.0)
X f_double (row, C_SDIST, (sky.s_sdist>=10.0)?"%6.3f":"%6.4f",
X sky.s_sdist);
X if (p != SUN)
X f_double (row, C_ELONG, "%6.1f", sky.s_elong);
X if (p != OBJX && p != OBJY)
X f_double (row, C_SIZE, (p==MOON||p==SUN)?"%4.0f":"%4.1f",
X sky.s_size);
X f_double (row, C_MAG, (p==MOON||p==SUN)?"%4.0f":"%4.1f",
X sky.s_mag);
X if (sky.s_sdist > 0.0) {
X /* some terminals scroll when write a char in low-right corner.
X * TODO: is there a nicer way to handle this maybe?
X */
X int col = row == NR ? C_PHASE - 1 : C_PHASE;
X /* would just do this if Turbo-C 2.0 "%?.0f" worked:
X * f_double (row, col, "%3.0f", sky.s_phase);
X */
X f_int (row, col, "%3d", sky.s_phase);
X }
X }
X
X f_angle (row, C_AZ, sky.s_az);
X f_angle (row, C_ALT, sky.s_alt);
X}
X
X/* print body info in the second menu format */
Xstatic
Xalt2_body (p, force, np)
Xint p; /* which body, as in astro.h/screen.h defines */
Xint force; /* whether to print for sure or only if things have changed */
XNow *np;
X{
X double ltr, lts, ltt, azr, azs, altt;
X int row = bodyrow[p];
X int status;
X double tmp;
X int today_tup = 0;
X
X /* always recalc OBJX and Y since we don't know it's the same object */
X if (!riset_cir (p, np, p==OBJX || p==OBJY, alt2_stdhzn?STDHZN:ADPHZN,
X <r, <s, <t, &azr, &azs, &altt, &status) && !force)
X return;
X
X alt_nobody (p);
X
X if (status & RS_ERROR) {
X /* can not find where body is! */
X f_string (row, C_RISETM, "?Error?");
X return;
X }
X if (status & RS_CIRCUMPOLAR) {
X /* body is up all day */
X f_string (row, C_RISETM, "Circumpolar");
X if (status & RS_NOTRANS)
X f_string (row, C_TRANSTM, "No transit");
X else {
X f_mtime (row, C_TRANSTM, ltt);
X if (status & RS_2TRANS)
X f_char (row, C_TRANSTM+5, '+');
X f_angle (row, C_TRANSALT, altt);
X }
X f_string (row, C_TUP, "24:00"); /*f_mtime() changes to 0:00 */
X return;
X }
X if (status & RS_NEVERUP) {
X /* body never up at all today */
X f_string (row, C_RISETM, "Never up");
X f_mtime (row, C_TUP, 0.0);
X return;
X }
X
X if (status & RS_NORISE) {
X /* object does not rise as such today */
X f_string (row, C_RISETM, "Never rises");
X ltr = 0.0; /* for TUP */
X today_tup = 1;
X } else {
X f_mtime (row, C_RISETM, ltr);
X if (status & RS_2RISES) {
X /* object rises more than once today */
X f_char (row, C_RISETM+5, '+');
X }
X f_angle (row, C_RISEAZ, azr);
X }
X
X if (status & RS_NOTRANS)
X f_string (row, C_TRANSTM, "No transit");
X else {
X f_mtime (row, C_TRANSTM, ltt);
X if (status & RS_2TRANS)
X f_char (row, C_TRANSTM+5, '+');
X f_angle (row, C_TRANSALT, altt);
X }
X
X if (status & RS_NOSET) {
X /* object does not set as such today */
X f_string (row, C_SETTM, "Never sets");
X lts = 24.0; /* for TUP */
X today_tup = 1;
X } else {
X f_mtime (row, C_SETTM, lts);
X if (status & RS_2SETS)
X f_char (row, C_SETTM+5, '+');
X f_angle (row, C_SETAZ, azs);
X }
X
X tmp = lts - ltr;
X if (tmp < 0)
X tmp = 24.0 + tmp;
X f_mtime (row, C_TUP, tmp);
X if (today_tup)
X f_char (row, C_TUP+5, '+');
X}
X
X/* print body info in third menu format. this may be either the geocentric
X * or topocentric angular separation between object p and each of the others.
X * the latter, of course, includes effects of refraction and so can change
X * quite rapidly near the time of each planets rise or set.
X * for now, we don't save old values so we always redo everything and ignore
X * the "force" argument. this isn't that bad since body_cir() has memory and
X * will avoid most computations as we hit them again in the lower triangle.
X * we are limited to only 5 columns per object. to make it fit, we display
X * degrees:minutes if less than 100 degrees, otherwise just whole degrees.
X */
X/*ARGSUSED*/
Xstatic
Xalt3_body (p, force, np)
Xint p; /* which body, as in astro.h/screen.h defines */
Xint force; /* whether to print for sure or only if things have changed */
XNow *np;
X{
X int row = bodyrow[p];
X Sky skyp, skyq;
X double spy, cpy, px, *qx, *qy;
X int wantx = obj_ison(OBJX);
X int wanty = obj_ison(OBJY);
X double as = plot_ison() || srch_ison() ? 0.0 : 60.0;
X int q;
X
X (void) body_cir (p, as, np, &skyp);
X if (alt3_geoc) {
X /* use ra for "x", dec for "y". */
X spy = sin (skyp.s_dec);
X cpy = cos (skyp.s_dec);
X px = skyp.s_ra;
X qx = &skyq.s_ra;
X qy = &skyq.s_dec;
X } else {
X /* use azimuth for "x", altitude for "y". */
X spy = sin (skyp.s_alt);
X cpy = cos (skyp.s_alt);
X px = skyp.s_az;
X qx = &skyq.s_az;
X qy = &skyq.s_alt;
X }
X for (q = nxtbody(-1); q != -1; q = nxtbody(q))
X if (q != p && (q != OBJX || wantx) && (q != OBJY || wanty)) {
X double sep, dsep;
X (void) body_cir (q, as, np, &skyq);
X sep = acos(spy*sin(*qy) + cpy*cos(*qy)*cos(px-*qx));
X dsep = raddeg(sep);
X if (dsep >= (100.0 - 1.0/60.0/2.0))
X f_int (row, bodycol[q], "%5d:", dsep);
X else
X f_angle (row, bodycol[q], sep);
X }
X}
END_OF_FILE
if test 10867 -ne `wc -c <'altmenus.c'`; then
echo shar: \"'altmenus.c'\" unpacked with wrong size!
fi
# end of 'altmenus.c'
fi
if test -f 'circum.c' -a "${1}" != "-c" ; then
echo shar: Will not clobber existing file \"'circum.c'\"
else
echo shar: Extracting \"'circum.c'\" \(10483 characters\)
sed "s/^X//" >'circum.c' <<'END_OF_FILE'
X/* fill in a Sky struct with all we know about each object.
X *(the user defined objects are in obj.c)
X */
X
X#include <stdio.h>
X#include <math.h>
X#include "astro.h"
X#include "circum.h"
X#include "screen.h" /* just for SUN and MOON */
X
X/* find body p's circumstances now.
X * to save some time the caller may specify a desired accuracy, in arc seconds.
X * if, based on its mean motion, it would not have moved this much since the
X * last time we were called we only recompute altitude and azimuth and avoid
X * recomputing the planet's heliocentric position. use 0.0 for best possible.
X * we always recompute the user-defined objects' position regardless.
X * return 0 if only alt/az changes, else 1 if all other stuff updated too.
X * TODO: beware of fast retrograde motions.
X */
Xbody_cir (p, as, np, sp)
Xint p;
Xdouble as;
XNow *np;
XSky *sp;
X{
X typedef struct {
X double l_dpas; /* mean days per arc second */
X Now l_now; /* when l_sky was found */
X double l_ra, l_dec; /* the eod, ie, unprecessed, ra/dec values */
X Sky l_sky;
X } Last;
X /* must be in same order as the astro.h object #define's */
X static Last last[8] = {
X {.000068, {NOMJD}},
X {.00017, {NOMJD}},
X {.00053, {NOMJD}},
X {.0034, {NOMJD}},
X {.0092, {NOMJD}},
X {.027, {NOMJD}},
X {.046, {NOMJD}},
X {.069, {NOMJD}}
X };
X Last objxlast, objylast;
X double lst, alt, az;
X double ehp, ha, dec; /* ehp: angular dia of earth from body */
X Last *lp;
X int new;
X
X switch (p) {
X case SUN: return (sun_cir (as, np, sp));
X case MOON: return (moon_cir (as, np, sp));
X case OBJX: lp = &objxlast; break;
X case OBJY: lp = &objylast; break;
X default: lp = last + p; break;
X }
X
X /* if less than l_every days from last time for this planet
X * just redo alt/az.
X * ALWAYS redo objects x and y.
X */
X if (p != OBJX && p != OBJY && same_cir (np, &lp->l_now)
X && about_now (np, &lp->l_now, as*lp->l_dpas)) {
X *sp = lp->l_sky;
X new = 0;
X } else {
X double lpd0, psi0; /* heliocentric ecliptic long and lat */
X double rp0; /* dist from sun */
X double rho0; /* dist from earth */
X double lam, bet; /* geocentric ecliptic long and lat */
X double dia, mag; /* angular diameter at 1 AU and magnitude */
X double lsn, rsn; /* true geoc lng of sun, dist from sn to earth*/
X double el; /* elongation */
X double f; /* phase from earth */
X
X lp->l_now = *np;
X sunpos (mjd, &lsn, &rsn);
X if (p == OBJX || p == OBJY)
X obj_cir(mjd,p,&lpd0,&psi0,&rp0,&rho0,&lam,&bet,&sp->s_mag);
X else {
X double deps, dpsi;
X double a;
X plans(mjd, p, &lpd0, &psi0, &rp0, &rho0, &lam, &bet, &dia,&mag);
X nutation (mjd, &deps, &dpsi); /* correct for nutation */
X lam += dpsi;
X a = lsn-lam; /* and 20.4" aberation */
X lam -= degrad(20.4/3600)*cos(a)/cos(bet);
X bet -= degrad(20.4/3600)*sin(a)*sin(bet);
X }
X
X ecl_eq (mjd, bet, lam, &lp->l_ra, &lp->l_dec);
X
X sp->s_ra = lp->l_ra;
X sp->s_dec = lp->l_dec;
X if (epoch != EOD)
X precess (mjd, epoch, &sp->s_ra, &sp->s_dec);
X sp->s_edist = rho0;
X sp->s_sdist = rp0;
X elongation (lam, bet, lsn, &el);
X el = raddeg(el);
X sp->s_elong = el;
X f = (rp0 > 0.0)
X ? 0.25 * (((rp0+rho0)*(rp0+rho0) - rsn*rsn)/(rp0*rho0)) : 0.0;
X sp->s_phase = f*100.0; /* percent */
X if (p != OBJX && p != OBJY) {
X sp->s_size = dia/rho0;
X sp->s_mag = mag + 5.0*log(rp0*rho0/sqrt(f))/log(10.0);
X }
X sp->s_hlong = lpd0;
X sp->s_hlat = psi0;
X new = 1;
X }
X
X /* alt, az; correct for parallax and refraction; use eod ra/dec */
X now_lst (np, &lst);
X ha = hrrad(lst) - lp->l_ra;
X if (sp->s_edist > 0.0) {
X ehp = (2.0*6378.0/146.0e6) / sp->s_edist;
X ta_par (ha, lp->l_dec, lat, height, ehp, &ha, &dec);
X } else
X dec = lp->l_dec;
X hadec_aa (lat, ha, dec, &alt, &az);
X refract (pressure, temp, alt, &alt);
X sp->s_alt = alt;
X sp->s_az = az;
X lp->l_sky = *sp;
X return (new);
X}
X
X/* find local times when sun is 18 degrees below horizon.
X * return 0 if just returned same stuff as previous call, else 1 if new.
X */
Xtwilight_cir (np, dawn, dusk, status)
XNow *np;
Xdouble *dawn, *dusk;
Xint *status;
X{
X static Now last_now = {NOMJD};
X static double last_dawn, last_dusk;
X static int last_status;
X int new;
X
X if (same_cir (np, &last_now) && same_lday (np, &last_now)) {
X *dawn = last_dawn;
X *dusk = last_dusk;
X *status = last_status;
X new = 0;
X } else {
X double x;
X (void) riset_cir (SUN,np,0,TWILIGHT,dawn,dusk,&x,&x,&x,&x,status);
X last_dawn = *dawn;
X last_dusk = *dusk;
X last_status = *status;
X last_now = *np;
X new = 1;
X }
X return (new);
X}
X
X/* find sun's circumstances now.
X * as is the desired accuracy, in arc seconds; use 0.0 for best possible.
X * return 0 if only alt/az changes, else 1 if all other stuff updated too.
X */
Xsun_cir (as, np, sp)
Xdouble as;
XNow *np;
XSky *sp;
X{
X static Sky last_sky;
X static Now last_now = {NOMJD};
X static double last_ra, last_dec; /* unprecessed ra/dec */
X double lst, alt, az;
X double ehp, ha, dec; /* ehp: angular dia of earth from body */
X int new;
X
X if (same_cir (np, &last_now) && about_now (np, &last_now, as*.00028)) {
X *sp = last_sky;
X new = 0;
X } else {
X double lsn, rsn;
X double deps, dpsi;
X
X last_now = *np;
X sunpos (mjd, &lsn, &rsn); /* sun's true ecliptic long
X * and dist
X */
X nutation (mjd, &deps, &dpsi); /* correct for nutation */
X lsn += dpsi;
X lsn -= degrad(20.4/3600); /* and light travel time */
X
X sp->s_edist = rsn;
X sp->s_sdist = 0.0;
X sp->s_elong = 0.0;
X sp->s_size = raddeg(4.65242e-3/rsn)*3600*2;
X sp->s_mag = -26.8;
X sp->s_hlong = lsn-PI; /* geo- to helio- centric */
X range (&sp->s_hlong, 2*PI);
X sp->s_hlat = 0.0;
X
X ecl_eq (mjd, 0.0, lsn, &last_ra, &last_dec);
X sp->s_ra = last_ra;
X sp->s_dec = last_dec;
X if (epoch != EOD)
X precess (mjd, epoch, &sp->s_ra, &sp->s_dec);
X new = 1;
X }
X
X now_lst (np, &lst);
X ha = hrrad(lst) - last_ra;
X ehp = (2.0 * 6378.0 / 146.0e6) / sp->s_edist;
X ta_par (ha, last_dec, lat, height, ehp, &ha, &dec);
X hadec_aa (lat, ha, dec, &alt, &az);
X refract (pressure, temp, alt, &alt);
X sp->s_alt = alt;
X sp->s_az = az;
X last_sky = *sp;
X return (new);
X}
X
X/* find moon's circumstances now.
X * as is the desired accuracy, in arc seconds; use 0.0 for best possible.
X * return 0 if only alt/az changes, else 1 if all other stuff updated too.
X */
Xmoon_cir (as, np, sp)
Xdouble as;
XNow *np;
XSky *sp;
X{
X static Sky last_sky;
X static Now last_now = {NOMJD};
X static double ehp;
X static double last_ra, last_dec; /* unprecessed */
X double lst, alt, az;
X double ha, dec;
X int new;
X
X if (same_cir (np, &last_now) && about_now (np, &last_now, as*.000021)) {
X *sp = last_sky;
X new = 0;
X } else {
X double lam, bet;
X double deps, dpsi;
X double lsn, rsn; /* sun long in rads, earth-sun dist in au */
X double edistau; /* earth-moon dist, in au */
X double el; /* elongation, rads east */
X
X last_now = *np;
X moon (mjd, &lam, &bet, &ehp); /* moon's true ecliptic loc */
X nutation (mjd, &deps, &dpsi); /* correct for nutation */
X lam += dpsi;
X range (&lam, 2*PI);
X
X sp->s_edist = 6378.14/sin(ehp); /* earth-moon dist, want km */
X sp->s_size = 3600*31.22512*sin(ehp);/* moon angular dia, seconds */
X sp->s_hlong = lam; /* save geo in helio fields */
X sp->s_hlat = bet;
X
X ecl_eq (mjd, bet, lam, &last_ra, &last_dec);
X sp->s_ra = last_ra;
X sp->s_dec = last_dec;
X if (epoch != EOD)
X precess (mjd, epoch, &sp->s_ra, &sp->s_dec);
X
X sunpos (mjd, &lsn, &rsn);
X range (&lsn, 2*PI);
X elongation (lam, bet, lsn, &el);
X
X /* solve triangle of earth, sun, and elongation for moon-sun dist */
X edistau = sp->s_edist/1.495979e8; /* km -> au */
X sp->s_sdist =
X sqrt (edistau*edistau + rsn*rsn - 2.0*edistau*rsn*cos(el));
X
X /* TODO: improve mag; this is based on a flat moon model. */
X sp->s_mag = -12.7 + 2.5*(log10(PI) - log10(PI/2*(1+1.e-6-cos(el))));
X
X sp->s_elong = raddeg(el); /* want degrees */
X sp->s_phase = fabs(el)/PI*100.0; /* want non-negative % */
X new = 1;
X }
X
X /* show topocentric alt/az by correcting ra/dec for parallax
X * as well as refraction.
X */
X now_lst (np, &lst);
X ha = hrrad(lst) - last_ra;
X ta_par (ha, last_dec, lat, height, ehp, &ha, &dec);
X hadec_aa (lat, ha, dec, &alt, &az);
X refract (pressure, temp, alt, &alt);
X sp->s_alt = alt;
X sp->s_az = az;
X last_sky = *sp;
X return (new);
X}
X
X/* given geocentric ecliptic longitude and latitude, lam and bet, of some object
X * and the longitude of the sun, lsn, find the elongation, el. this is the
X * actual angular separation of the object from the sun, not just the difference
X * in the longitude. the sign, however, IS set simply as a test on longitude
X * such that el will be >0 for an evening object <0 for a morning object.
X * to understand the test for el sign, draw a graph with lam going from 0-2*PI
X * down the vertical axis, lsn going from 0-2*PI across the hor axis. then
X * define the diagonal regions bounded by the lines lam=lsn+PI, lam=lsn and
X * lam=lsn-PI. the "morning" regions are any values to the lower left of the
X * first line and bounded within the second pair of lines.
X * all angles in radians.
X */
Xelongation (lam, bet, lsn, el)
Xdouble lam, bet, lsn;
Xdouble *el;
X{
X *el = acos(cos(bet)*cos(lam-lsn));
X if (lam>lsn+PI || lam>lsn-PI && lam<lsn) *el = - *el;
X}
X
X/* return whether the two Nows are for the same observing circumstances. */
Xsame_cir (n1, n2)
Xregister Now *n1, *n2;
X{
X return (n1->n_lat == n2->n_lat
X && n1->n_lng == n2->n_lng
X && n1->n_temp == n2->n_temp
X && n1->n_pressure == n2->n_pressure
X && n1->n_height == n2->n_height
X && n1->n_tz == n2->n_tz
X && n1->n_epoch == n2->n_epoch);
X}
X
X/* return whether the two Nows are for the same LOCAL day */
Xsame_lday (n1, n2)
XNow *n1, *n2;
X{
X return (mjd_day(n1->n_mjd - n1->n_tz/24.0) ==
X mjd_day(n2->n_mjd - n2->n_tz/24.0));
X}
X
X/* return whether the mjd of the two Nows are within dt */
Xstatic
Xabout_now (n1, n2, dt)
XNow *n1, *n2;
Xdouble dt;
X{
X return (fabs (n1->n_mjd - n2->n_mjd) <= dt/2.0);
X}
X
Xnow_lst (np, lst)
XNow *np;
Xdouble *lst;
X{
X utc_gst (mjd_day(mjd), mjd_hr(mjd), lst);
X *lst += radhr(lng);
X range (lst, 24.0);
X}
X
X/* round a time in days, *t, to the nearest second, IN PLACE. */
Xrnd_second (t)
Xdouble *t;
X{
X *t = floor(*t*SPD+0.5)/SPD;
X}
X
Xdouble
Xmjd_day(jd)
Xdouble jd;
X{
X return (floor(jd-0.5)+0.5);
X}
X
Xdouble
Xmjd_hr(jd)
Xdouble jd;
X{
X return ((jd-mjd_day(jd))*24.0);
X}
END_OF_FILE
if test 10483 -ne `wc -c <'circum.c'`; then
echo shar: \"'circum.c'\" unpacked with wrong size!
fi
# end of 'circum.c'
fi
if test -f 'ephem.db' -a "${1}" != "-c" ; then
echo shar: Will not clobber existing file \"'ephem.db'\"
else
echo shar: Extracting \"'ephem.db'\" \(11652 characters\)
sed "s/^X//" >'ephem.db' <<'END_OF_FILE'
X* ephem database.
X*
X* these are sorted for easy reading but they don't have to be in any order.
X* things will run faster if you put the objects you use nearer the top.
X*
X* elliptical format:
X* i = inclination, degrees
X* O = longitude of ascending node, degrees
X* o = argument of perihelion, degrees
X* a = mean distance (aka semi-major axis), AU
X* n = daily motion, degrees per day
X* e = eccentricity,
X* M = mean anomaly (ie, degrees from perihelion),
X* E = epoch date (ie, time of M),
X* D = the equinox year (ie, time of i/O/o).
X* g/k or H/G = magnitude model
X*
X* parabolic format:
X* epoch of perihelion,
X* inclination, degrees
X* argument of perihelion, degrees
X* perihelion distance, AU
X* longitude of the ascending node, degrees
X* reference epoch of the parameters,
X* absolute magnitude,
X* luminosity index
X*
X* fixed format:
X* ra, hours
X* dec, degrees
X* magnitude
X* reference epoch
X
X* from IAU circular 4985
XAustin,p,4/9.9715/1990,58.9574,61.5625,0.349854,75.2223,1950.0,4.5,4
X* from IAU circular 4986
XCernis,p,3/17.2967/1990,48.138,100.588,1.06849,347.727,1950,0,0
X* from IAU circular 4984
XGeorge,p,4/11.9396/1990,59.3652,137.8482,1.569001,279.3118,1950,0,0
X*Comet Levy (1990c) elements from IAUC 5060 (25 Jul 1990);g & k by J. Fedock
XLevy,p,10/24.6277/1990,131.5951,242.6328,0.938779,138.6561,1950.0,4.2,3.4
X*Comet Tsuchiya-Kiuchi (1990i) from IAUC 5055 (19 Jul 1990);g & k by J. Fedock
XTK,p,9/28.648/1990,143.758,180.830,1.09430,330.059,1950,5.5,4
X
X*Comet Honda-Mrkos-Pajdusakova (1990f) elements from IAUC 5035 (19 June 1990)
X*g & k via least squares fit by J. Fedock (10 Aug 90).
XHMP,e,4.2224,88.7097,325.702,3.03891,0.186049,0.821936,0,9/12.6864/1990,1950,g14.018,7.946
X
X* updated elements for Pluto
XPluto,e,17.1519,110.2183,113.5202,39.37210,.00398953,0.24678,0.1782,10/1/1989,2000.0,g5.0,0.0
X
XVesta,e,7.139,104.015,149.986,2.3607,0.27174,0.0906,152.190,11/5/1990,2000.0,3.16,0.34
XVesta89,e,7.139,104.015,150.175,2.3613,0.27163,0.0906,43.314,10/1/1989,2000.0,3.16,0.34
XCeres,e,10.607,80.702,71.274,2.7685,0.21396,0.0780,287.265,10/1/1989,2000.0,3.32,0.11
XHalley,e,162.238,58.154,111.857,17.9435,0.0129674,0.9673,0,1986.109,1950,3.66,7.05
XPallas,e,34.804,173.323,309.796,2.7703,0.21375,0.2347,273.779,10/1/1989,2000.0,4.13,0.15
XEunomia,e,11.76001,292.89583,97.40910,2.6446692,0.22916434,0.1850083,236.28800,8/27/1988,1950.0,5.22,0.20
XEunomia,e,11.765,293.619,97.591,2.6437,0.22929,0.1849,327.856,10/1/1989,2000.0,5.22,0.20
XJuno,e,12.991,170.542,246.787,2.6692,0.22601,0.2575,205.808,11/5/1990,2000.0,5.31,0.30
XJuno89,e,12.993,170.556,246.744,2.6682,0.22614,0.2580,115.411,10/1/1989,2000.0,5.31,0.30
XHygiea,e,3.840,283.833,315.832,3.1365,0.17743,0.1202,104.089,11/5/1990,2000.0,5.37,0.15
XIris,e,5.513,260.100,144.725,2.3864,0.26735,0.2292,239.261,11/5/1990,2000.0,5.56,0.25
XHebe,e,14.781,139.033,238.480,2.4250,0.26100,0.2020,253.786,11/5/1990,2000.0,5.70,0.24
XHerculina,e,16.35677,107.39552,75.08723,2.7711409,0.21365652,0.1763770,199.36894,10/1/1989,1950.0,5.78,0.22
XAmphitrite,e,6.110,356.625,63.020,2.5546,0.24139,0.0715,294.249,11/5/1990,2000.0,5.84,0.21
XDembowska,e,8.264,32.824,343.637,2.9246,0.19707,0.0901,257.577,11/5/1990,2000.0,5.98,0.32
XPsyche,e,3.089,150.508,227.697,2.9229,0.19723,0.1333,37.474,11/5/1990,2000.0,5.98,0.22
XPsyche89,e,3.089,150.508,227.581,2.9234,0.19718,0.1335,318.680,10/1/1989,2000.0,5.98,0.22
XInteramnia,e,17.301,281.072,92.206,3.0631,0.18385,0.1471,350.196,11/5/1990,2000.0,6.00,0.02
XLaetitia,e,10.368,157.417,208.197,2.7677,0.21405,0.1145,237.595,11/5/1990,2000.0,6.16,0.25
XDavida,e,15.937,107.998,339.207,3.1728,0.17439,0.1783,314.054,11/5/1990,2000.0,6.17,0.02
XIrene,e,9.113,86.863,95.016,2.5858,0.23703,0.1665,223.034,11/5/1990,2000.0,6.27,0.09
XIrene89,e,9.113,86.867,95.052,2.5867,0.23691,0.1661,128.194,10/1/1989,2000.0,6.27,0.09
XEuropa,e,7.439,129.275,337.304,3.1022,0.18038,0.1000,164.467,11/5/1990,2000.0,6.29,0.15
XElenora,e,18.429,140.729,5.535,2.7962,0.21079,0.1170,304.553,11/5/1990,2000.0,6.32,0.32
XMetis,e,5.585,69.112,5.315,2.3865,0.26733,0.1219,270.833,10/1/1989,2000.0,6.32,0.29
XMelpomene,e,10.137,150.705,227.396,2.2950,0.28349,0.2185,200.804,11/5/1990,2000.0,6.41,0.17
XFlora,e,5.888,111.120,284.896,2.2016,0.30171,0.1561,296.988,11/5/1990,2000.0,6.48,0.33
XKalliope,e,13.696,66.469,355.776,2.9112,0.19842,0.0977,291.742,11/5/1990,2000.0,6.49,0.22
X
XSirius,f,6:45:9,-16:43,-1.4,2000
XCanopus,f,6:23:57,-52:41,-0.7,2000
XArcturus,f,14:15:40,19:11,-0.1,2000
XVega,f,18:36:56,38:47,0.04,2000
XCapella,f,5:16:41,46:0,0.06,2000
XRigel,f,5:14:32,-8:12,0.15,2000
XRigil,f,14:39:36,-60:50,0.33,2000
XProcyon,f,7:39:18,5:14,0.36,2000
XAchernar,f,1:37:42,-57:15,0.49,2000
XHadar,f,14:3:50,-60:22,0.61,2000
XAltair,f,19:50:47,8:52,0.75,2000
XBetelgeuse,f,5:55:10,7:24,0.8,2000
XAldebaran,f,4:35:55,16:30,0.86,2000
XSpica,f,13:25:11,-11:9,0.97,2000
XAntares,f,16:29:25,-26:26,1.08,2000
XPollux,f,7:45:19,28:1,1.15,2000
XFomalhaut,f,22:57:39,-29:37,1.15,2000
XDeneb,f,20:41:26,45:16,1.25,2000
XMimosa,f,12:47:44,-59:42,1.27,2000
XRegulus,f,10:8:22,11:58,1.35,2000
XAdara,f,6:58:38,-28:58,1.5,2000
XShaula,f,17:33:36,-37:6,1.62,2000
XBellatrix,f,5:25:8,6:21,1.63,2000
XAlnath,f,5:26:17,28:36,1.65,2000
XAlnilam,f,5:36:12,-1:12,1.69,2000
XDubhe,f,11:3:44,61:45,1.79,2000
XAlioth,f,12:54:2,55:57,1.79,2000
XMirfak,f,3:24:20,49:51,1.8,2000
XKaus,f,18:24:10,-34:23,1.83,2000
XBenetnasch,f,13:47:32,49:19,1.88,2000
XMenkalinan,f,5:59:32,44:57,1.9,2000
XMirzam,f,6:22:42,-17:57,1.98,2000
XMira,f,2:19:21,-2:59,2,2000
XHamal,f,2:7:10,23:27,2.01,2000
XDiphda,f,0:43:35,-17:59,2.03,2000
XPolaris,f,2:31:13,89:15,2.04,2000
XMirach,f,1:9:44,35:37,2.06,2000
XAlpheratz,f,0:8:23,29:5,2.07,2000
XRas,f,17:34:56,12:34,2.07,2000
XKocab,f,14:50:43,74:9,2.07,2000
XDenebola,f,11:49:4,14:34,2.13,2000
XAlgol,f,3:8:11,40:57,2.15,2000
XMintaka,f,5:32:1,0:18,2.2,2000
XSchedar,f,0:40:31,56:32,2.22,2000
XRastaban,f,17:56:36,51:29,2.23,2000
XAlphecca,f,15:34:41,26:43,2.23,2000
XMizar,f,13:23:56,54:56,2.27,2000
XCaph,f,0:9:10,59:9,2.27,2000
XMerak,f,11:1:51,56:23,2.38,2000
XPulcherrima,f,14:44:59,27:5,2.4,2000
XEniph,f,21:44:11,9:53,2.4,2000
XPhecda,f,11:53:49,53:42,2.43,2000
XAlderamin,f,21:18:35,62:35,2.44,2000
XMarkab,f,23:4:46,15:12,2.5,2000
XMekab,f,3:2:17,4:6,2.52,2000
XZozca,,f,11:14:6,20:31,2.56,2000
XArneb,f,5:32:44,-17:50,2.58,2000
XZuben,f,15:17:0,-9:23,2.61,2000
XPhakt,f,5:39:39,-34:5,2.63,2000
XSheratan,f,1:54:39,20:48,2.63,2000
XUnukalhay,f,15:44:17,6:25,2.65,2000
XMuphrid,f,13:54:41,18:24,2.68,2000
XTarazed,f,19:46:15,10:37,2.72,2000
XIB,f,14:50:53,-16:3,2.75,2000
XCursa,f,5:7:51,-5:5,2.77,2000
XKelb,f,17:43:28,4:34,2.77,2000
XKornephoros,f,16:30:13,21:29,2.78,2000
XAlwaid,f,17:30:26,52:19,2.79,2000
XAlgenib,f,0:13:14,15:11,2.83,2000
XVindemiatrix,f,13:2:11,10:58,2.83,2000
XAlcyone,f,3:47:29,24:7,2.87,2000
XSadalsud,f,21:31:34,-5:35,2.88,2000
XGomeisa,f,7:27:9,8:17,2.89,2000
XSadalmelik,f,22:5:47,0:19,2.93,2000
XZaurak,f,3:58:2,-13:31,2.95,2000
XMEbsuta,f,6:43:56,25:8,2.99,2000
XAlbireo,f,19:30:43,27:58,3.08,2000
XTalitha,f,8:59:13,48:2,3.15,2000
XAlphirk,f,21:28:39,70:33,3.18,2000
XAlrai,f,23:39:20,77:37,3.22,2000
XSulaphat,f,18:58:56,32:41,3.25,2000
XSkat,f,22:54:39,-15:49,3.27,2000
XMegrez,f,12:15:26,57:2,3.31,2000
XHomam,f,22:41:27,10:50,3.39,2000
XSheliak,f,18:50:4,33:22,3.43,2000
XNekkar,f,15:1:57,40:23,3.49,2000
XWasat,f,7:20:7,21:59,3.53,2000
XRotanev,f,20:37:33,14:36,3.58,2000
XZawijah,f,11:50:42,1:46,3.61,2000
XThuban,f,14:4:24,64:22,3.65,2000
XBaten,f,1:51:27,-10:20,3.72,2000
XSvalocin,f,20:39:39,15:55,3.77,2000
XSadachbia,f,22:21:39,-1:23,3.84,2000
XZuben,f,15:35:32,-14:47,3.9,2000
XAlbireo,f,19:30:45,27:58,5.11,2000
XM1,f,5:34:30,22:2,8.4,2000
XM2,f,21:33:17,0:47,6.3,2000
XM3,f,13:42:9,28:21,6.4,2000
XM4,f,16:23:18,-26:30,6.4,2000
XM5,f,15:19:16,2:5,6.2,2000
XM6,f,17:39:38,-32:13,5.3,2000
XM7,f,17:53:40,-34:48,3.2,2000
XM8,f,18:3:32,-24:23,6,2000
XM9,f,17:18:28,-18:31,7.3,2000
XM10,f,16:57:19,-4:7,6.7,2000
XM11,f,18:51:21,-6:16,6.3,2000
XM12,f,16:47:18,-1:58,6.6,2000
XM13,f,16:41:54,36:27,5.7,2000
XM14,f,17:37:19,-3:15,7.7,2000
XM15,f,21:30:13,12:12,6,2000
XM16,f,18:19:25,-13:47,6.5,2000
XM17,f,18:21:27,-16:11,7,2000
XM18,f,18:19:27,-17:8,7.5,2000
XM19,f,17:2:33,-26:15,6.6,2000
XM20,f,18:2:31,-23:2,9,2000
XM21,f,18:4:31,-22:30,6.5,2000
XM22,f,18:36:32,-23:55,5.9,2000
XM23,f,17:56:29,-19:1,6.9,2000
XM24,f,18:18:28,-18:24,4.6,2000
XM25,f,18:32:29,-19:15,6,2000
XM26,f,18:45:22,-9:24,9.3,2000
XM27,f,20:0:5,22:44,7.6,2000
XM28,f,18:24:33,-24:52,7.3,2000
XM29,f,20:23:55,38:32,7.1,2000
XM30,f,21:40:25,-23:8,8.4,2000
XM31,f,0:43:22,41:17,4.8,2000
XM32,f,0:43:22,40:53,8.7,2000
XM33,f,1:34:25,30:41,6.7,2000
XM34,f,2:42:37,42:49,5.5,2000
XM35,f,6:9:32,24:21,5.3,2000
XM36,f,5:36:40,34:6,6.3,2000
XM37,f,5:53:38,32:33,6.2,2000
XM38,f,5:28:41,35:49,7.4,2000
XM39,f,21:32:54,48:28,5.2,2000
XM40,f,12:35:19,58:13,9,2000
XM41,f,6:47:3,-20:44,5,2000
XM42,f,5:35:14,-5:23,5,2000
XM43,f,5:35:14,-5:16,7,2000
XM44,f,8:40:26,19:59,3.7,2000
XM45,f,3:47:29,24:8,1.4,2000
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END_OF_FILE
if test 11652 -ne `wc -c <'ephem.db'`; then
echo shar: \"'ephem.db'\" unpacked with wrong size!
fi
# end of 'ephem.db'
fi
if test -f 'plot.c' -a "${1}" != "-c" ; then
echo shar: Will not clobber existing file \"'plot.c'\"
else
echo shar: Extracting \"'plot.c'\" \(11261 characters\)
sed "s/^X//" >'plot.c' <<'END_OF_FILE'
X/* code to support the plotting capabilities.
X * idea is to let the operator name a plot file and mark some fields for
X * logging. then after each screen update, the logged fields are written to
X * the plot file. later, the file may be plotted (very simplistically by
X * ephem, for now anyway, or by some other program entirely.).
X *
X * format of the plot file is one line per coordinate: label,x,y
X * if z was specified, it is a fourth field.
X * x,y,z are plotted using %g format.
X */
X
X#include <stdio.h>
X#include <math.h>
X#include "screen.h"
X
Xextern char *strcpy();
Xextern errno;
Xextern char *sys_errlist[];
X#define errsys (sys_errlist[errno])
X
X#define TRACE(x) {FILE *fp = fopen("trace","a"); fprintf x; fclose(fp);}
X
X#define MAXPLTLINES 10 /* max number of labeled lines we can track.
X * note we can't store more than NFLOGS fields
X * anyway (see flog.c).
X */
X#define FNLEN (14+1) /* longest filename; plus 1 for \0 */
X
Xstatic char plt_filename[FNLEN] = "ephem.plt"; /* default plot file name */
Xstatic FILE *plt_fp; /* the plot file; == 0 means don't plot */
X
X/* store the label and rcfpack()s for each line to track. */
Xtypedef struct {
X char pl_label;
X int pl_rcpx, pl_rcpy, pl_rcpz;
X} PltLine;
Xstatic PltLine pltlines[MAXPLTLINES];
Xstatic int npltlines; /* number of pltlines[] in actual use */
X
Xstatic int plt_in_polar; /*if true plot in polar coords, else cartesian*/
Xstatic int pltsrchfld; /* set when the Search field is to be plotted */
X
X/* picked the Plot label:
X * if on, just turn it off.
X * if off, turn on, define fields or select name of file to plot and do it.
X * TODO: more flexibility, more relevance.
X */
Xplot_setup()
X{
X if (plt_fp)
X plt_turn_off();
X else {
X static char *chcs[4] = {
X "Select fields", "Display a plot file", (char *)0,
X "Begin plotting"
X };
X static int fn; /* start with 0, then remember for next time */
X ask:
X chcs[2] = plt_in_polar ? "Polar coords" : "Cartesian coords";
X switch (popup(chcs, fn, npltlines > 0 ? 4 : 3)) {
X case 0: fn = 0; plt_select_fields(); goto ask;
X case 1: fn = 1; plt_file(); goto ask;
X case 2: fn = 2; plt_in_polar ^= 1; goto ask;
X case 3: fn = 3; plt_turn_on(); break;
X default: break;
X }
X }
X}
X
X/* write the active plotfields to the current plot file, if one is open. */
Xplot()
X{
X if (plt_fp) {
X PltLine *plp;
X double x, y, z;
X if (!srch_ison() && pltsrchfld) {
X /* if searching is not on but we are plotting the search
X * funtion we must evaluate and log it ourselves here and now.
X * plt_turn_on() insured there is a good function to eval.
X * N.B. if searching IS on, we rely on main() having called
X * srch_eval() BEFORE plot() so it is already evaluated.
X */
X double e;
X char errmsg[128];
X if (execute_expr (&e, errmsg) < 0) {
X f_msg (errmsg);
X plt_turn_off();
X return;
X } else
X (void) flog_log (R_SRCH, C_SRCH, e, "");
X }
X /* plot in order of original selection */
X for (plp = pltlines; plp < &pltlines[npltlines]; plp++) {
X if (flog_get (plp->pl_rcpx, &x, (char *)0) == 0
X && flog_get (plp->pl_rcpy, &y, (char *)0) == 0) {
X (void) fprintf (plt_fp, "%c,%.12g,%.12g", plp->pl_label,
X x, y);
X if (flog_get (plp->pl_rcpz, &z, (char *)0) == 0)
X (void) fprintf (plt_fp, ",%.12g", z);
X (void) fprintf (plt_fp, "\n");
X }
X }
X }
X}
X
Xplot_prstate (force)
Xint force;
X{
X static last;
X int this = plt_fp != 0;
X
X if (force || this != last) {
X f_string (R_PLOT, C_PLOTV, this ? " on" : "off");
X last = this;
X }
X}
X
Xplot_ison()
X{
X return (plt_fp != 0);
X}
X
Xstatic
Xplt_reset()
X{
X PltLine *plp;
X
X for (plp = &pltlines[npltlines]; --plp >= pltlines; ) {
X (void) flog_delete (plp->pl_rcpx);
X (void) flog_delete (plp->pl_rcpy);
X (void) flog_delete (plp->pl_rcpz);
X plp->pl_rcpx = plp->pl_rcpy = plp->pl_rcpz = 0;
X }
X npltlines = 0;
X pltsrchfld = 0;
X}
X
X/* let operator select the fields he wants to plot.
X * register them with flog and keep rcfpack() in pltlines[] array.
X * as a special case, set pltsrchfld if Search field is selected.
X */
Xstatic
Xplt_select_fields()
X{
X static char hlp[] = "move and RETURN to select a field, or q to quit";
X static char sry[] = "Sorry; can not log any more fields.";
X int r = R_UT, c = C_UTV; /* TODO: start where main was? */
X int sf = rcfpack (R_SRCH, C_SRCH, 0);
X char buf[64];
X int rcp;
X int i;
X
X plt_reset();
X for (i = 0; i < MAXPLTLINES; i++) {
X (void) sprintf (buf, "select x field for line %d", i+1);
X rcp = sel_fld (r, c, alt_menumask()|F_PLT, buf, hlp);
X if (!rcp)
X break;
X if (flog_add (rcp) < 0) {
X f_msg (sry);
X break;
X }
X pltlines[i].pl_rcpx = rcp;
X if (rcp == sf)
X pltsrchfld = 1;
X
X (void) sprintf (buf, "select y field for line %d", i+1);
X r = unpackr (rcp); c = unpackc (rcp);
X rcp = sel_fld (r, c, alt_menumask()|F_PLT, buf, hlp);
X if (!rcp) {
X (void) flog_delete (pltlines[i].pl_rcpx);
X break;
X }
X if (flog_add (rcp) < 0) {
X (void) flog_delete (pltlines[i].pl_rcpx);
X f_msg (sry);
X break;
X }
X pltlines[i].pl_rcpy = rcp;
X if (rcp == sf)
X pltsrchfld = 1;
X
X (void) sprintf (buf, "select z field for line %d", i+1);
X r = unpackr (rcp); c = unpackc (rcp);
X rcp = sel_fld (r, c, alt_menumask()|F_PLT, buf, hlp);
X if (rcp) {
X if (flog_add (rcp) < 0) {
X (void) flog_delete (pltlines[i].pl_rcpx);
X (void) flog_delete (pltlines[i].pl_rcpy);
X f_msg (sry);
X break;
X }
X pltlines[i].pl_rcpz = rcp;
X if (rcp == sf)
X pltsrchfld = 1;
X r = unpackr (rcp); c = unpackc (rcp);
X }
X
X do {
X (void) sprintf(buf,"enter a one-character label for line %d: ",
X i+1);
X f_prompt (buf);
X } while (read_line (buf, 1) != 1);
X pltlines[i].pl_label = *buf;
X }
X npltlines = i;
X}
X
Xstatic
Xplt_turn_off ()
X{
X (void) fclose (plt_fp);
X plt_fp = 0;
X plot_prstate(0);
X}
X
X/* turn on plotting.
X * establish a file to use (and thereby set plt_fp, the plotting_is_on flag).
X * also check that there is a srch function if it is being plotted.
X */
Xstatic
Xplt_turn_on ()
X{
X int sf = rcfpack(R_SRCH, C_SRCH, 0);
X char fn[FNLEN], fnq[NC];
X char *optype;
X int n;
X PltLine *plp;
X
X /* insure there is a valid srch function if we are to plot it */
X for (plp = &pltlines[npltlines]; --plp >= pltlines; )
X if ((plp->pl_rcpx == sf || plp->pl_rcpy == sf || plp->pl_rcpz == sf)
X && !prog_isgood()) {
X f_msg ("Plotting search function but it is not defined.");
X return;
X }
X
X /* prompt for file name, giving current as default */
X (void) sprintf (fnq, "file to write <%s>: ", plt_filename);
X f_prompt (fnq);
X n = read_line (fn, sizeof(fn)-1);
X
X /* leave plotting off if type END.
X * reuse same fn if just type \n
X */
X if (n < 0)
X return;
X if (n > 0)
X (void) strcpy (plt_filename, fn);
X
X /* give option to append if file already exists */
X optype = "w";
X if (access (plt_filename, 2) == 0) {
X while (1) {
X f_prompt ("files exists; append or overwrite (a/o)?: ");
X n = read_char();
X if (n == 'a') {
X optype = "a";
X break;
X }
X if (n == 'o')
X break;
X }
X }
X
X /* plotting is on if file opens ok */
X plt_fp = fopen (plt_filename, optype);
X if (!plt_fp) {
X char buf[NC];
X (void) sprintf (buf, "can not open %s: %s", plt_filename, errsys);
X f_prompt (buf);
X (void)read_char();
X } else {
X /* add a title if desired */
X static char tp[] = "Title (q to skip): ";
X f_prompt (tp);
X if (read_line (fnq, PW - sizeof(tp)) > 0)
X (void) fprintf (plt_fp, "* %s\n", fnq);
X }
X plot_prstate (0);
X}
X
X/* ask operator for a file to plot. if it's ok, do it.
X */
Xstatic
Xplt_file ()
X{
X char fn[FNLEN], fnq[64];
X FILE *pfp;
X int n;
X
X /* prompt for file name, giving current as default */
X (void) sprintf (fnq, "file to read <%s>: ", plt_filename);
X f_prompt (fnq);
X n = read_line (fn, sizeof(fn)-1);
X
X /* forget it if type END.
X * reuse same fn if just type \n
X */
X if (n < 0)
X return;
X if (n > 0)
X (void) strcpy (plt_filename, fn);
X
X /* do the plot if file opens ok */
X pfp = fopen (plt_filename, "r");
X if (pfp) {
X if (plt_in_polar)
X plot_polar (pfp);
X else
X plot_cartesian (pfp);
X (void) fclose (pfp);
X } else {
X char buf[NC];
X (void) sprintf (buf, "can not open %s: %s", plt_filename, errsys);
X f_prompt (buf);
X (void)read_char();
X }
X}
X
X/* plot the given file on the screen in cartesian coords.
X * TODO: add z tags somehow
X * N.B. do whatever you like but redraw the screen when done.
X */
Xstatic
Xplot_cartesian (pfp)
XFILE *pfp;
X{
X static char fmt[] = "%c,%lf,%lf";
X double x, y; /* N.B. be sure these match what scanf's %lf wants*/
X double minx, maxx, miny, maxy;
X char buf[128];
X int npts = 0;
X char c;
X
X /* find ranges and number of points */
X while (fgets (buf, sizeof(buf), pfp)) {
X if (sscanf (buf, fmt, &c, &x, &y) != 3)
X continue;
X if (npts++ == 0) {
X maxx = minx = x;
X maxy = miny = y;
X } else {
X if (x > maxx) maxx = x;
X else if (x < minx) minx = x;
X if (y > maxy) maxy = y;
X else if (y < miny) miny = y;
X }
X }
X
X#define SMALL (1e-10)
X if (npts < 2 || fabs(minx-maxx) < SMALL || fabs(miny-maxy) < SMALL)
X f_prompt ("At least two different points required to plot.");
X else {
X /* read file again, this time plotting */
X rewind (pfp);
X c_erase();
X while (fgets (buf, sizeof(buf), pfp)) {
X int row, col;
X if (sscanf (buf, fmt, &c, &x, &y) != 3)
X continue;
X row = NR-(int)((NR-1)*(y-miny)/(maxy-miny)+0.5);
X col = 1+(int)((NC-1)*(x-minx)/(maxx-minx)+0.5);
X if (row == NR && col == NC)
X col--; /* avoid lower right scrolling corner */
X f_char (row, col, c);
X }
X
X /* label axes */
X f_double (1, 1, "%g", maxy);
X f_double (NR-1, 1, "%g", miny);
X f_double (NR, 1, "%g", minx);
X f_double (NR, NC-10, "%g", maxx);
X }
X
X /* hit any key to resume... */
X (void) read_char();
X redraw_screen (2); /* full redraw */
X}
X
X/* plot the given file on the screen in polar coords.
X * first numberic field in plot file is r, second is theta in degrees.
X * TODO: add z tags somehow
X * N.B. do whatever you like but redraw the screen when done.
X */
Xstatic
Xplot_polar (pfp)
XFILE *pfp;
X{
X static char fmt[] = "%c,%lf,%lf";
X double r, th; /* N.B. be sure these match what scanf's %lf wants*/
X double maxr;
X char buf[128];
X int npts = 0;
X char c;
X
X /* find ranges and number of points */
X while (fgets (buf, sizeof(buf), pfp)) {
X if (sscanf (buf, fmt, &c, &r, &th) != 3)
X continue;
X if (npts++ == 0)
X maxr = r;
X else
X if (r > maxr)
X maxr = r;
X }
X
X if (npts < 2)
X f_prompt ("At least two points required to plot.");
X else {
X /* read file again, this time plotting */
X rewind (pfp);
X c_erase();
X while (fgets (buf, sizeof(buf), pfp)) {
X int row, col;
X double x, y;
X if (sscanf (buf, fmt, &c, &r, &th) != 3)
X continue;
X x = r * cos(th/57.2958); /* degs to rads */
X y = r * sin(th/57.2958);
X row = NR-(int)((NR-1)*(y+maxr)/(2.0*maxr)+0.5);
X col = 1+(int)((NC-1)*(x+maxr)/(2.0*maxr)/ASPECT+0.5);
X if (row == NR && col == NC)
X col--; /* avoid lower right scrolling corner */
X f_char (row, col, c);
X }
X
X /* label radius */
X f_double (NR/2, NC-10, "%g", maxr);
X }
X
X /* hit any key to resume... */
X (void) read_char();
X redraw_screen (2); /* full redraw */
X}
END_OF_FILE
if test 11261 -ne `wc -c <'plot.c'`; then
echo shar: \"'plot.c'\" unpacked with wrong size!
fi
# end of 'plot.c'
fi
if test -f 'version.c' -a "${1}" != "-c" ; then
echo shar: Will not clobber existing file \"'version.c'\"
else
echo shar: Extracting \"'version.c'\" \(9448 characters\)
sed "s/^X//" >'version.c' <<'END_OF_FILE'
X/* N.B. please increment version and date and note each change. */
X
X#include "screen.h"
X
Xstatic char vmsg[] = "Version 4.21 August 23, 1990";
X
X/*
X * 4.21 8/23/90 fix dawn/dusk near vernal equinox.
X * 4.20 8/15/90 add g/k and H/G magnitude model options for elliptical objects.
X * 8/17 put moon's geocentric long/lat under Hlong/Hlat columns.
X * allow entering negative decimal years.
X * 8/20 init all static mjd storage to unlike times.
X * 8/21 add USE_TERMIO option to io.c.
X * 4.19 8/7/90 add listing feature, with 'L' hot-key.
X * add title for plot file (as well as listing file).
X * add some (void) casts for lint sake.
X * 4.18 8/2/90 fix parabolic comet bug in objx.c (bad lam computation).
X * 4.17 7/2/90 add 'c' short cut to Menu field.
X * display full Dec precision for fixed objx setup.
X * increase pluto auscale in watch.c, and guard screen boundries.
X * add Pause feature.
X * 7/27 further improve rise/set and dawn/dusk times.
X * add MENU={DATA,RISET,SEP} config/arg option.
X * 4.16 5/30/90 watch popup now allows changing formats without returning.
X * add 'w' short cut to watch field.
X * improve labeling a bit in Dome display.
X * 4.15 5/2/90 move setjmp() in main so it catches fp errs from ephem.cfg too.
X * 5/15 maintain name of objx/y.
X * clean up objx.c.
X * 5/16 fix bug circum.c related to phase of fixed objects.
X * 5/22 add "Sky dome" watch display format (idea from Jeffery Cook).
X * 5/23 remember last selection in watch, search, and plot popup menus.
X * cleanup layout and add labels in the watch screens.
X * 4.14 4/9/90 add y to body_tags[] in watch.c.
X * 4/10 add ! support (#ifdef BANG in sel_fld()).
X * 4/17 add #ifdef VMS and allow for no time zones (Karsten Spang).
X * 4/23 switch to EPHEMCFG (no more HOME).
X * add #include <stdlib.h> #ifdef VMS wherever atof() is used.
X * 4/24 fix phase so it works for objects out of the ecliptic.
X * 4.13 3/9/90 add support for second user-def object: "object y"
X * fix bug updating obj ref epoch (always used PARABOLIC's)
X * fix Turbo C workaround that prevented plotting sun dist.
X * 3/13 fix bug preventing searching on separation column for objx
X * 3/22 revamp elliptical object definition parameters to match AA.
X * permit exiting/redrawing properly from within a popup too.
X * add a bit more precision to plot labels.
X * let plot files have comments too, ie, leading *'s
X * 3/23 add "Lookup" to search config file for objects.
X * 3/30 separate database from config file; add -d and EPHEMDB env var.
X * catch SIGFPE and longjmp() back into main interation loop.
X * 4/3 add magnitude to fixed-object database fields.
X * 4.12 1/12/90 lay framework for orbital element support for object x.
X * 1/15 fix slight bug related to nutation.
X * plot fields in the same order they were selected.
X * 1/18 add copywrite notice in main.c.
X * note <sys/time.h> in time.c for BSD 4.3.
X * 1/20 work on fixed and parabolic orbital elements.
X * 1/25 work on elliptical orbital elements.
X * 2/1 work on objx's magnitude models.
X * add confirmation question before quitting.
X * 2/6 add d,o,z special speed move chars.
X * 2/8 watch: add LST to night sky and maintain RTC time back in main.
X * 2/12 fix bug in timezone related to daytime flag.
X * add w (week) watch advance key code.
X * add cautionary note about no string[s].h to Readme
X * 2/15 allow for precession moving dec outside range -90..90.
X * 2/19 fix bug that wiggled cursor during plotting in rise/set menu.
X * 2/20 fix bug preventing DAWN/DUSK/LON from being used in search func.
X * 4.11 12/29 add PC_GRAPHICS option in mainmenu.c (no effect on unix version)
X * 1/3/90 fix twilight error when sun never gets as low as -18 degs.
X * 1/4/90 always find alt/az from eod ra/dec, not from precessed values.
X * 1/9/90 lastmjd in plans.c was an int: prevented needless recalcs.
X * 4.10 12/6/89 fix transit times of circumpolar objects that don't rise.
X * fix plotting search function when searching is not on.
X * 12/12 fix Objx rise/set bug.
X * 12/21 don't erase last watch positions until computed all new ones.
X * 12/23 added USE_BIOSCALLS to io.c: Doug McDonald's BIOS calls
X * 12/27 allow dates to be entered as decimal years (for help with plots)
X * 12/27 remove literal ESC chars in strings in io.c.
X * 4.9 11/28/89 provide two forms of non-blocking reads for unix in io.c
X * 11/30/89 take out superfluous ESC testing in chk_arrow().
X * guard better against bogus chars in sel_fld().
X * use %lf in scanf's.
X * command-line arg PROPTS+ adds to settings from config file.
X * change (int) casts in moduloes to (long) for 16bit int systems.
X * 4.8 10/28/89 use doubles everywhere
X * 10/31/89 add direct planet row selection codes.
X * 11/2/89 improve compiler's fieldname parser.
X * 11/3/89 switch from ESC to q for "go on" (CBREAK ESC not very portable)
X * 11/6/89 allow plotting the search function too.
X * 11/8/89 suppress screen updates while plotting and nstep > 1.
X * 11/9/89 fix bug prohibiting plotting venus' sdist and objx's transit.
X * 11/9/89 add option to plot in polar coords.
X * 11/12/89 fix bug related to updating timezone name when it is changed.
X * 11/21/89 fix bug in when to print info about object-x
X * 11/21/89 increase MAXPLTLINES to 10 (to ease plotting all planet seps)
X * 11/22/89 allow setting fields from command line too.
X * 4.7 10/13/89 start adding general searching feature. start with flogging.
X * 10/17/89 add compiler, first menu ideas, get binary srch working.
X * 10/18/89 add parabolic-extrema and secant-0 solvers.
X * 10/23/89 finish up new idea of one-line control and set-up "popup" menus.
X * 4.6 10/29/89 improve transit circumstances by iterating as with rise/set.
X * allow changing lst.
X * show Updating message at better times.
X * avoid overstrikes while watching and add trails option.
X * allow for Turbo-C 2.0 printf bug using %?.0f".
X * 4.5 9/24/89 add third table of all mutual planet angular distances.
X * 4.4 9/21/89 add second planet table with rise/set times.
X * all rise/set times may now use standard or adaptive horizons.
X * 4.3 9/6/89 NM/FM calendar overstikes now use local time (was ut).
X * display elongation of object x.
X * better handling of typo when asking for refraction model.
X * 4.2 7/24/89 specify 7 digits to plot file (not just default to 6)
X * 4.1 7/18/89 use buffered output and fflush in read_char().
X * 4.0 7/8/89 add simple sky and solarsystem plotting (and rearrange fields)
X * change mars' .cfg mnemonic from a to m.
X * clean up nstep/NEW CIR handling
X * quit adding our own .cfg suffixes, but...
X * add looking for $HOME/.ephemrc (Ronald Florence)
X * drop -b
X * no longer support SITE
X * 3.17 6/15/89 misspelt temperature prompt; sun -/= bug. (Mike McCants)
X * change sun() to sunpos() for sake of Sun Microsystems.
X * 3.16 6/9/89 allow JD to be set and plotted.
X * c_clear (LATTIC_C) should use J not j (Alex Pruss)
X * support SIGINT (Ronald Florence)
X * 3.15 6/8/89 forget SIMPLETZ: now TZA and TZB.
X * 3.14 6/6/89 add back borders but allow turning off via -b
X * 3.13 5/26/89 fix Day/Nite picking loc bug.
X * 3.12 5/25/89 add SIMPLETZ option to time.c for systems w/o tzset()
X * files; couldn't plot dayln or niteln.
X * 3.11 5/16/89 local time prompt said utc; add NiteLn; check for bad plot
X * 3.10 4/27/89 allow caps for moving cursor around too
X * 3.9 4/5/89 discard leading termcap delay digits, for now
X * 3.8 3/2/89 shorten displayed precision, add heliocentric lat/long
X * 3.7 2/13/89 change to ^d to quit program.
X * 3.6 2/7/89 try adding .cfg suffix if can't find config file
X * 3.5 2/2/89 sunrise/set times based on actual sun size and pressure/temp
X * 3.4 1/22/89 calendar and all rise/set times based on local date, not utc
X * 3.3 1/6/89 add z to plot files (still don't plot it however)
X * 3.2 1/3/89 if set date/time then time does not inc first step
X * 3.1 1/1/89 user def. graph labels; nstep/stpsz control; genuine c_eol
X * 3.0 12/31/88 add graphing; add version to credits.
X * 2.7 12/30/88 add version to credits.
X * 2.6 12/28/88 twilight defined as 18 rather than 15 degrees below horizon
X * 2.5 12/26/88 remove trace capability; add screen shadowing: ^l.
X * 2.4 10/31/88 add credits banner, -s turns it off; savings time fix.
X * 2.3 9/23/88 exchange Altitude/Elevation titles (no code changes)
X * 2.2 9/20/88 more caution in aaha_aux() guarding acos() arg range
X * 2.1 9/14/88 moon phase always >= 0 to match planets convention
X * 2.0 9/13/88 add version ^v option
X */
X
Xversion()
X{
X f_msg (vmsg);
X}
X
Xstatic char *cre[] = {
X"Ephem - an interactive astronomical ephemeris program",
Xvmsg,
X"",
X"Copyright (c) 1990 by Elwood Charles Downey",
X"",
X"Permission is granted to make and distribute copies of this program",
X"free of charge, provided the copyright notice and this permission",
X"notice are preserved on all copies. All other rights reserved.",
X"",
X"Many formulas and tables are based, with permission, on material found in",
X"\"Astronomy with your Personal Computer\"",
X"by Dr. Peter Duffett-Smith, Cambridge University Press, (c) 1985",
X"",
X"type any key to continue..."
X};
Xcredits()
X{
X int r = 6; /* first row of credits message */
X int l;
X
X c_erase();
X for (l = 0; l < sizeof(cre)/sizeof(cre[0]); l++)
X f_string (r++, (NC - strlen(cre[l]))/2, cre[l]);
X (void) read_char(); /* wait for any char to continue */
X}
END_OF_FILE
if test 9448 -ne `wc -c <'version.c'`; then
echo shar: \"'version.c'\" unpacked with wrong size!
fi
# end of 'version.c'
fi
echo shar: End of archive 3 \(of 6\).
cp /dev/null ark3isdone
MISSING=""
for I in 1 2 3 4 5 6 ; do
if test ! -f ark${I}isdone ; then
MISSING="${MISSING} ${I}"
fi
done
if test "${MISSING}" = "" ; then
echo You have unpacked all 6 archives.
rm -f ark[1-9]isdone
else
echo You still need to unpack the following archives:
echo " " ${MISSING}
fi
## End of shell archive.
exit 0
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