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swevents.c
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swevents.c
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/* SWISSEPH
**************************************************************/
/* Copyright (C) 1997 - 2021 Astrodienst AG, Switzerland. All rights reserved.
License conditions
------------------
This file is part of Swiss Ephemeris.
Swiss Ephemeris is distributed with NO WARRANTY OF ANY KIND. No author
or distributor accepts any responsibility for the consequences of using it,
or for whether it serves any particular purpose or works at all, unless he
or she says so in writing.
Swiss Ephemeris is made available by its authors under a dual licensing
system. The software developer, who uses any part of Swiss Ephemeris
in his or her software, must choose between one of the two license models,
which are
a) GNU Affero General Public License (AGPL)
b) Swiss Ephemeris Professional License
The choice must be made before the software developer distributes software
containing parts of Swiss Ephemeris to others, and before any public
service using the developed software is activated.
If the developer choses the AGPL software license, he or she must fulfill
the conditions of that license, which includes the obligation to place his
or her whole software project under the AGPL or a compatible license.
See https://www.gnu.org/licenses/agpl-3.0.html
If the developer choses the Swiss Ephemeris Professional license,
he must follow the instructions as found in http://www.astro.com/swisseph/
and purchase the Swiss Ephemeris Professional Edition from Astrodienst
and sign the corresponding license contract.
The License grants you the right to use, copy, modify and redistribute
Swiss Ephemeris, but only under certain conditions described in the License.
Among other things, the License requires that the copyright notices and
this notice be preserved on all copies.
Authors of the Swiss Ephemeris: Dieter Koch and Alois Treindl
The authors of Swiss Ephemeris have no control or influence over any of
the derived works, i.e. over software or services created by other
programmers which use Swiss Ephemeris functions.
The names of the authors or of the copyright holder (Astrodienst) must not
be used for promoting any software, product or service which uses or contains
the Swiss Ephemeris. This copyright notice is the ONLY place where the
names of the authors can legally appear, except in cases where they have
given special permission in writing.
The trademarks 'Swiss Ephemeris' and 'Swiss Ephemeris inside' may be used
for promoting such software, products or services.
*/
static char *info = "\n\
Computes planetary phenomena\n\
for a given start date and a time range.\n\
Input can either be a date or an absolute julian day number.\n\
0:00 (midnight).\n\
Precision of this program:\n\
Conjunctions: Deviations from Rosicrucian Ephemeris result from\n\
the fact that R.E. gives ephemeris time.\n\
Ingresses: ditto.\n\
Stations: ditto. The stations given by AA are different, they\n\
are in rectascension.\n\
Max. Elongations: AA gives date and hour. This program computes \n\
e.g. 20 Aug. 96, 3:28. AA has a rounded value of 4h.\n\
Transits: There is no venus transit in 20th cty.\n\
There was a transit of mercury in 1993. The ingress\n\
and egress times computed by this program agree\n\
exactly with AA93, p. A86.\n\
Visibility: elongation > 10 degrees, according to AA.\n\
gr. brillancy: Our times of greatest brillancy differ from the\n\
ones given by AA94 and AA96, p. A3, by several days.\n\
Probably an error of AA. The times on p. A3 are\n\
inconsistent with the magnitudes listed on p. A4.\n\
The maxima computed by this program are consistent\n\
with these magnitude tables.\n\
\n\
Command line options:\n\
\n\
example:\n\
swevents -p3 -bj2436723.5 -n1000 -s1 -ejpl \n\
for -p2 (mercury), use -s0.3 \n\
\n\
-mscreen output on screen\n\
-mps postscript [default: HP Laserjet]\n\
-cl do not print command line at bottom of 1st page\n\
-p planet to be computed.\n\
See the letter coding below.\n\
-nN output data for N consecutive days; if no -n option\n\
is given, the default is 1. If the option -n without a\n\
number is given, the default is 20.\n\
-sN timestep N days, default 1. This option is only meaningful\n\
when combined with option -n.\n\
-edirPATH change the directory of the ephemeris files \n\
-cycol.. number cycles per column\n\
-doall | -doingr etc : do just that\n\
-doing45 crossings over 15 tau, Leo, Sco, Aqu\n\
(are not included with doall)\n\
-noingr no ingresses\n\
-motab special format Moon ingres table\n\
-mojap special format Moon phases\n\
-bDATE use this begin date instead of asking; use -b1.1.1992 if\n\
the begin date string contains blanks; use format -bj2400000.5\n\
to express the date as absolute Julian day number.\n\
Note: the date format is day month year (European style).\n\
-eswe swiss ephemeris\n\
-ejpl jpl ephemeris (DE431), or with ephemeris file name\n\
-ejplde200.eph\n\
-emos moshier ephemeris\n\
-true true positions\n\
-noaberr no aberration\n\
-nodefl no gravitational light deflection\n\
-noprec no precession (i.e. J2000 positions)\n\
-nonut no nutation \n\
-dgap use gap within date\n\
-zlong use long sign names\n\
-znam3 use 3-letter sign names\n\
-monnum use month numbers instead of names\n\
-gmtoff X use X hours gmt offset (+ for east)\n\
-tzoneTIMEZONE output date and time in timezone (hours east)\n\
-transitstderr lists transits of Venus or Mercury as c style data to stderr \n\
-jd show also jd in output \n\
-ep use extended precision in output\n\
\n\
-? display this info\n\
\n\
Planet selection letters:\n\
0 Sun (character zero)\n\
1 Moon (character 1)\n\
2 Mercury\n\
....\n\
9 Pluto\n\
10 mean lunar node\n\
11 true lunar node\n\
12 mean lunar apogee\n\
13 true lunar apogee\n\
14 earth\n\
15 chiron etc up to 22, see swephexp.h\n\
h00 .. h18 fictitious factors, see swephexp.h\n\
\n\
Date entry:\n\
In the interactive mode, when you are asked for a start date,\n\
you can enter data in one of the following formats:\n\
\n\
1.2.1991 three integers separated by a nondigit character for\n\
day month year. Dates are interpreted as Gregorian\n\
after 4.10.1582 and as Julian Calender before.\n\
Time is always set to midnight.\n\
If the three letters jul are appended to the date,\n\
the Julian calendar is used even after 1582.\n\
If the four letters greg are appended to the date,\n\
the Gregorian calendar is used even before 1582.\n\
\n\
j2400123.67 the letter j followed by a real number, for\n\
the absolute Julian daynumber of the start date.\n\
Fraction .5 indicates midnight, fraction .0\n\
indicates noon, other times of the day can be\n\
chosen accordingly.\n\
\n\
<RETURN> repeat the last entry\n\
\n\
. stop the program\n\
\n\
+20 advance the date by 20 days\n\
\n\
-10 go back in time 10 days\n";
/**************************************************************/
#define PRINTMOD 0
#if PRINTMOD
# include "ourdef.h"
# include "astrolib.h"
# include "printmod.h"
#else
# define PMODEL_SCREEN 10
#endif
#include "swephexp.h"
#include "swephlib.h"
#include "sweph.h"
#include "swevents.h"
#include <time.h>
#define MAX_LINES 67
#define MAX_COLS 2
double xcol[4] = {20.0, 110.0};
double xcol4[4] = {12.0, 60, 108.0, 156.0};
double xdate = 25; /* position of date */
double xpos = 52; /* position of date */
double ytop = 24;
double line_space = 4;
double gmtoff = 0;
int pmodel;
int ncycol = 0;
int do_flag = 0;
int prev_yout = -999999;
int max_cols = MAX_COLS;
#define J2000 2451545.0 /* 2000 January 1.5 */
#define square_sum(x) (x[0]*x[0]+x[1]*x[1]+x[2]*x[2])
#define SEFLG_EPHMASK (SEFLG_JPLEPH|SEFLG_SWIEPH|SEFLG_MOSEPH)
#define SUN_RADIUS (959.63 / 3600 * DEGTORAD) /* Meeus germ. p 391 */
#define VENUS_RADIUS (8.34 / 3600 * DEGTORAD) /* AA96 E43 */
#define MERCURY_RADIUS (3.36 / 3600 * DEGTORAD) /* AA96 E43 */
#define MARS_RADIUS (4.68 / 3600 * DEGTORAD) /* AA96 E43 */
#define UNUSED(expr) do { (void)(expr); } while (0)
#define BIT_ROUND_NO 0
#define BIT_ROUND_SEC 1
#define BIT_ROUND_MIN 2
#define BIT_ZODIAC 4
#define BIT_LZEROES 8
#define STRLEN_OUT_TEXT 20
static char *zod_nam[] = {"AR", "TA", "GE", "CN", "LE", "VI",
"LI", "SC", "SA", "CP", "AQ", "PI"};
static char *zod_nam3[] = {"ARI", "TAU", "GEM", "CAN", "LEO", "VIR",
"LIB", "SCO", "SAG", "CAP", "AQU", "PIS"};
static char *zod_nam_long[] = {"aries", "taurus", "gemini",
"cancer", "leo", "virgo",
"libra", "scorpio", "sagittarius",
"capricorn", "aquarius", "pisces"};
static char *month_nam[] = {"", "Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
static char motab[13][31][10]; /* table for moon ingresses */
char *planet_name;
AS_BOOL ephemeris_time = FALSE;
AS_BOOL do_not_round = FALSE;
AS_BOOL do_motab = FALSE;
AS_BOOL do_mojap = FALSE;
AS_BOOL date_gap = FALSE;
AS_BOOL show_jd = FALSE;
AS_BOOL print_cl = TRUE;
AS_BOOL output_extra_prec = FALSE;
AS_BOOL get_data_of_day = FALSE;
AS_BOOL transits_to_stderr = FALSE;
double phase_mod = 90;
char **znam = zod_nam;
char *gap = " ";
char sdatefrom[AS_MAXCH], sdateto[AS_MAXCH], syear0[80];
char sdate[AS_MAXCH];
AS_BOOL gregflag = TRUE;
int ipl;
double tzone = 0;
int whicheph = SEFLG_JPLEPH;
char cmdline[4 * AS_MAXCH];
char *stit = "Planetary Phenomena";
#if MSDOS
# define EPHEPATH "C:\\C600\\SOURCE\\SWEPH\\"
#else
# define EPHEPATH "/home/ephe"
#endif
static char *dms(double x, int iflag);
static int find_zero(double y00, double y11, double y2, double dx,
double *dxret, double *dxret2);
static int find_maximum(double y00, double y11, double y2, double dx,
double *dxret, double *yret);
static void print_item(char *s, double t, double x, double elo, double mag);
static int print_motab();
// from old swevents.c
static char *hms(double x, int32 iflag);
static int32 get_next_voc(double tet0, int32 iflag, int32 vocmethod, VOC *pvoc, char *serr);
static int32 calc_all_crossings(
int32 iflag, /* swiss ephemeris flags */
int32 itype, /* type of calculation:
* 0 = mundane aspects,
* 1 = transits,
* 2 = ingresses */
double tjd0, /* start time */
double tjde, /* end time */
double tstep, /* time step width */
char *splan, /* moving planets' string */
char *sasp, /* aspects string */
int32 npos, /* with ityp=1, number of transit positions */
double *dpos, /* transit/ingress positions */
struct event *pev, /* struct for output */
char *serr /* error string */
);
static int32 calc_all_voc(int32 iflag, double te, double tend, char *serr);
static int32 extract_data_of_day(int32 do_flag, double te, double dtol, char *splan, char *sasp, EVENT *pev, char *serr);
static int letter_to_ipl(int letter);
#define DO_CONJ 1
#define DO_RISE 2
#define DO_ELONG 4
#define DO_RETRO 8
#define DO_BRILL 16
#define DO_APS 32
#define DO_NODE 64
#define DO_LAT 128
#define DO_INGR 256
#define DO_LPHASE 512
#define DO_INGR45 1024 // add ingresses over 45,135,215,305° (mid of fixed signs)
#define DO_ASPECTS 2048
#define DO_VOC 4096
#define DO_ALL (DO_CONJ|DO_RISE|DO_ELONG|DO_RETRO|DO_BRILL|DO_APS|DO_NODE|DO_LAT|DO_INGR)
AS_BOOL sign_change(double x0, double x1)
{
if (x0 < 0 && x1 >= 0) return TRUE;
if (x0 >= 0 && x1 < 0) return TRUE;
return FALSE;
}
int main(int argc, char *argv[])
{
AS_BOOL is_opposition;
char serr[256];
char spnam[256];
char sout[AS_MAXCH], s[AS_MAXCH], saves[AS_MAXCH];
char *sp, *spsave;
char *spno;
int i, j, k, n, izod;
int jmon, jday, jyear;
double elong_vis, magme[3];
double jut = 0.0;
int iplfrom = SE_VENUS;
int nstep = 0, istep;
double dx;
double x[6], xs[6], x0[6], x1[6], x2[6];
double xp[6], xp0[6], xp1[6] = {0}, xp2[6], xs0[6], xs1[6] = {0}, xs2[6];
double xel0[6], xel1[6] = {0}, xel2[6], xang0[6], xang1[6] = {0}, xang2[6], xma0[6], xma1[6] = {0}, xma2[6];
double xh0[6], xh1[6] = {0}, xh2[6];
double attr[20];
double xel, xma, sunrad;
double dt, dt1, dt2, elong, rphel;
char ephepath[AS_MAXCH] = EPHEPATH;
char fname[80] = "de431.eph";
char *begindate = NULL;
int iflag = SEFLG_RADIANS | SEFLG_SPEED; /* external flag: helio, geo... */
int nzer, iflgret;
/*double tjd = 2436723.589269907;*/
double tjd = 2436723.588888889;
double t, te, tend, t2, t3, tstep;
double delt;
struct tm *tim;
time_t tloc;
EVENT *pev0;
tstep = 1;
nstep = 300;
pmodel = PMODEL_SCREEN;
strcpy(ephepath, EPHEPATH);
time(&tloc);
tim = localtime (&tloc);
sprintf(sdate, "%d/%02d/%02d", 1900+tim->tm_year, tim->tm_mon + 1, tim->tm_mday);
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-doall") == 0) {
do_flag = DO_ALL;
} else if (strcmp(argv[i], "-noingr") == 0) {
do_flag &= ~DO_INGR;
} else if (strcmp(argv[i], "-doconj") == 0) {
do_flag |= DO_CONJ;
} else if (strcmp(argv[i], "-dobrill") == 0) {
do_flag |= DO_BRILL;
} else if (strcmp(argv[i], "-dorise") == 0) {
do_flag |= DO_RISE;
} else if (strcmp(argv[i], "-doelong") == 0) {
do_flag |= DO_ELONG;
} else if (strcmp(argv[i], "-doretro") == 0) {
do_flag |= DO_RETRO;
} else if (strcmp(argv[i], "-doaps") == 0) {
do_flag |= DO_APS;
} else if (strcmp(argv[i], "-dolphase") == 0) {
do_flag |= DO_LPHASE;
} else if (strcmp(argv[i], "-donode") == 0) {
do_flag |= DO_NODE;
} else if (strcmp(argv[i], "-doingr") == 0) {
do_flag |= DO_INGR;
} else if (strcmp(argv[i], "-doing45") == 0) {
do_flag |= DO_INGR45;
} else if (strcmp(argv[i], "-doasp") == 0) {
do_flag |= DO_ASPECTS;
} else if (strcmp(argv[i], "-dovoc") == 0) {
do_flag |= DO_VOC;
} else if (strcmp(argv[i], "-getday") == 0) {
get_data_of_day = TRUE;
} else if (strcmp(argv[i], "-et") == 0) {
ephemeris_time = TRUE;
} else if (strcmp(argv[i], "-jd") == 0) {
show_jd = TRUE;
} else if (strncmp(argv[i], "-cycol", 6) == 0) {
ncycol = atoi(argv[i] + 6);
} else if (strcmp(argv[i], "-ep") == 0) {
output_extra_prec = TRUE;
} else if (strncmp(argv[i], "-ejpl", 5) == 0) {
whicheph = SEFLG_JPLEPH;
if (*(argv[i]+5) != '\0')
strcpy(fname, argv[i]+5);
} else if (strcmp(argv[i], "-eswe") == 0) {
whicheph = SEFLG_SWIEPH;
} else if (strcmp(argv[i], "-emos") == 0) {
whicheph = SEFLG_MOSEPH;
} else if (strcmp(argv[i], "-zlong") == 0) {
znam = zod_nam_long;
} else if (strcmp(argv[i], "-znam3") == 0) {
znam = zod_nam3;
} else if (strcmp(argv[i], "-monnum") == 0) {
for (n = 1; n <= 12; n++) {
month_nam[n] = malloc(4);
sprintf(month_nam[n], "%3d", n);
}
} else if (strcmp(argv[i], "-?") == 0) {
printf(info);
#if PRINTMOD
} else if (strcmp(argv[i], "-mpdf") == 0) {
pmodel = PMODEL_PDF;
} else if (strcmp(argv[i], "-mps") == 0) {
pmodel = PMODEL_PS;
} else if (strcmp(argv[i], "-mscreen") == 0) {
pmodel = PMODEL_SCREEN;
#endif
} else if (strcmp(argv[i], "-j2000") == 0) {
iflag |= SEFLG_J2000;
} else if (strcmp(argv[i], "-icrs") == 0) {
iflag |= SEFLG_ICRS;
} else if (strcmp(argv[i], "-hel") == 0) {
iflag |= SEFLG_HELCTR;
} else if (strcmp(argv[i], "-bary") == 0) {
iflag |= SEFLG_BARYCTR;
} else if (strcmp(argv[i], "-true") == 0) {
iflag |= SEFLG_TRUEPOS;
} else if (strcmp(argv[i], "-noaberr") == 0) {
iflag |= SEFLG_NOABERR;
} else if (strcmp(argv[i], "-nodefl") == 0) {
iflag |= SEFLG_NOGDEFL;
} else if (strcmp(argv[i], "-nonut") == 0) {
iflag |= SEFLG_NONUT;
} else if (strcmp(argv[i], "-noprec") == 0) {
iflag |= SEFLG_J2000;
} else if (strcmp(argv[i], "-roundmin") == 0) {
do_round_min = TRUE;
} else if (strcmp(argv[i], "-dgap") == 0) {
date_gap = TRUE;
} else if (strcmp(argv[i], "-motab") == 0) {
do_motab = TRUE;
do_flag = DO_INGR;
stit = "Sign Ingresses";
} else if (strcmp(argv[i], "-mojap") == 0) {
do_mojap = TRUE;
do_flag = DO_LPHASE;
phase_mod = 90;
xpos -= xdate;
xdate = 0;
max_cols = 4;
memcpy(xcol, xcol4, sizeof(xcol));
stit = "Phases";
if (atoi(argv[i+1]) > 0) {
phase_mod = atoi(argv[i+1]);
i++;
}
} else if (strcmp(argv[i], "-gmtoff") == 0) {
i++;
gmtoff = atof(argv[i]);
} else if (strncmp(argv[i], "-p", 2) == 0) {
spno = argv[i]+2;
/* single factor */
if (*spno >= '0' && *spno <= '9' && atol(spno) < SE_NPLANETS) {
iplfrom = atol(spno);
/* ecliptic, nutation */
} else if ((ipl = atol(spno)) == -1) {
iplfrom = ipl;
} else if (*spno == 'h') {
iplfrom = atol(spno + 1) + SE_FICT_OFFSET;
if (iplfrom > SE_WALDEMATH) {
printf("illegal planet number %s\n", argv[i]);
exit(1);
}
} else {
printf("illegal planet number %s\n", argv[i]);
exit(1);
}
} else if (strncmp(argv[i], "-n", 2) == 0) {
nstep = atoi(argv[i]+2);
} else if (strncmp(argv[i], "-s", 2) == 0) {
tstep = atof(argv[i]+2);
} else if (strncmp(argv[i], "-b", 2) == 0) {
begindate = argv[i] + 2;
} else if (strcmp(argv[i], "-cl") == 0) {
print_cl = FALSE;
} else if (strncmp(argv[i], "-g", 2) == 0) {
gap = argv[i] + 2;
if (*gap == '\0') gap = "\t";
} else if (strncmp(argv[i], "-tzone", 6) == 0) {
tzone = atof(argv[i]+6);
} else if (strncmp(argv[i], "-transitstderr", 6) == 0) {
transits_to_stderr = TRUE;
} else {
printf("illegal option %s\n", argv[i]);
exit(1);
}
}
strcpy(cmdline, "Command: ");
for (i = 0; i < argc; i++) {
if (strlen(cmdline) + strlen(argv[i]) < sizeof(cmdline) - 2)
sprintf(cmdline + strlen(cmdline), "%s ", argv[i]);
}
swe_version(sout);
#if PRINTMOD
if (pmodel != PMODEL_SCREEN) {
printmod_set_printer(pmodel, 0);
} else {
printf("%s\n\n", cmdline);
printf("Date: %s\tSwissEph version %s\n%s\n\n", sdate, sout, cmdline);
}
#else
printf("Date: %s\tSwissEph version %s\n%s\n\n", sdate, sout, cmdline);
#endif
swe_set_ephe_path(ephepath);
swe_set_jpl_file(fname);
iflag |= whicheph;
if (begindate == NULL) {
printf ("datum ?");
sp = fgets(s, AS_MAXCH, stdin);
} else {
sp = begindate;
begindate = "."; /* to exit afterwards */
}
spsave = sp;
if (*sp == '.') {
exit(1);
} else if (*sp == '\0') {
strcpy (s, saves);
} else {
strcpy (saves, s);
}
if (*sp == 'j') { /* it's a day number */
sscanf(sp+1,"%lf", &tjd);
if (tjd < 2299160.5)
gregflag = FALSE;
else
gregflag = TRUE;
if (strstr(sp, "jul") != NULL)
gregflag = FALSE;
else if (strstr(sp, "greg") != NULL)
gregflag = TRUE;
swe_revjul(tjd, gregflag, &jyear, &jmon, &jday, &jut);
} else if (*sp == '+') {
n = atoi(sp);
if (n == 0) n = 1;
tjd += n;
swe_revjul(tjd, gregflag, &jyear, &jmon, &jday, &jut);
} else if (*sp == '-') {
n = atoi(sp);
if (n == 0) n = -1;
tjd += n;
swe_revjul(tjd, gregflag, &jyear, &jmon, &jday, &jut);
} else {
if (sscanf (sp, "%d%*c%d%*c%d", &jday,&jmon,&jyear) < 1) exit(1);
if (jyear * 10000 + jmon * 100 + jday < 15821015)
gregflag = FALSE;
else
gregflag = TRUE;
if (strstr(sp, "jul") != NULL)
gregflag = FALSE;
else if (strstr(sp, "greg") != NULL)
gregflag = TRUE;
tjd = swe_julday(jyear,jmon,jday,jut,gregflag); /* PLACALC :
get jd for the
date you want */
}
sprintf(syear0, "%02d", jyear);
swe_revjul(tjd + tstep * nstep, gregflag, &jyear, &jmon, &jday, &jut);
sprintf(sdateto, "%02d", jyear);
for (t = tjd, istep = 0; istep <= nstep; t += tstep, istep++) {
if (t < 2299160.5)
gregflag = FALSE;
else
gregflag = TRUE;
if (strstr(spsave, "jul") != NULL)
gregflag = FALSE;
else if (strstr(spsave, "greg") != NULL)
gregflag = TRUE;
swe_revjul(t, gregflag, &jyear, &jmon, &jday, &jut);
if (!ephemeris_time) {
//delt = swe_deltat(t);
delt = swe_deltat_ex(t, whicheph, serr);
te = t + delt;
} else {
te = t;
}
ipl = iplfrom;
switch(ipl) {
case SE_SUN:
planet_name = "Sun";
break;
case SE_VENUS:
planet_name = "Venus";
break;
case SE_MERCURY:
planet_name = "Mercury";
break;
case SE_MARS:
planet_name = "Mars";
break;
case SE_JUPITER:
planet_name = "Jupiter";
break;
case SE_SATURN:
planet_name = "Saturn";
break;
case SE_URANUS:
planet_name = "Uranus";
break;
case SE_NEPTUNE:
planet_name = "Neptune";
break;
case SE_PLUTO:
planet_name = "Pluto";
break;
default:
swe_get_planet_name(ipl, spnam);
planet_name = spnam;
break;
}
// handle the three old swevents.c modes and exit
if (get_data_of_day) {
if ((pev0 = (EVENT *) calloc((size_t) NEVENTMAX, sizeof(EVENT))) == NULL) {
fprintf(stderr, "could not allocate structure for event data\n");
return ERR;
}
if (extract_data_of_day(do_flag, te, 1.6, SPLAN_ASPECTS, SASP_ASPECTS, pev0, serr) == ERR) {
fprintf(stderr, "%s\n", serr);
return ERR;
}
return OK;
}
/* moon void of course */
if (do_flag & DO_VOC) {
tend = te + nstep;
if (calc_all_voc(iflag, te, tend, serr) == ERR) {
fprintf(stderr, "%s\n", serr);
return ERR;
}
return OK;
}
/* mundane aspects */
if (do_flag & DO_ASPECTS) {
tend = te + nstep;
if ((pev0 = (EVENT *) calloc((size_t) NEVENTMAX, sizeof(EVENT))) == NULL) {
fprintf(stderr, "could not allocate structure for event data\n");
return ERR;
}
if (calc_all_crossings(iflag, CTYP_MASPECTS, te, tend, tstep, SPLAN_ASPECTS, SASP_ASPECTS, 0, NULL, pev0, serr) == ERR) {
fprintf(stderr, "%s\n", serr);
return ERR;
}
return OK;
}
/* we have always
* - three positions and speeds for venus
* - three positions and speeds for sun
* - three elongations of venus (with elongation speed)
* - three magnitudes
*/
memcpy(xp0, xp1, 6 * sizeof(double)); /* planet */
memcpy(xp1, xp2, 6 * sizeof(double));
memcpy(xh0, xh1, 6 * sizeof(double)); /* heliocentric */
memcpy(xh1, xh2, 6 * sizeof(double)); /* heliocentric */
memcpy(xs0, xs1, 6 * sizeof(double)); /* sun */
memcpy(xs1, xs2, 6 * sizeof(double));
memcpy(xel0, xel1, 6 * sizeof(double)); /* elongation in longitude */
memcpy(xel1, xel2, 6 * sizeof(double));
memcpy(xang0, xang1, 6 * sizeof(double));/* ang. dist. from sun */
memcpy(xang1, xang2, 6 * sizeof(double));
memcpy(xma0, xma1, 6 * sizeof(double)); /* magnitude */
memcpy(xma1, xma2, 6 * sizeof(double));
iflgret = swe_calc(te, (int) ipl, iflag, xp2, serr);
if (iflgret < 0) {
fprintf(stderr, "return code %d, mesg: %s\n", iflgret, serr);
}
iflgret = swe_calc(te, SE_SUN, iflag, xs2, serr);
if (iflgret < 0) {
fprintf(stderr, "return code %d, mesg: %s\n", iflgret, serr);
}
iflgret = swe_calc(te, (int) ipl, iflag/*|SEFLG_HELCTR*/, xh2, serr);
if (iflgret < 0) {
fprintf(stderr, "return code %d, mesg: %s\n", iflgret, serr);
}
/* true heliocentric distance */
/* elongation of planet measured on ecliptic */
for (i = 0; i <= 5; i++)
xel2[i] = xp2[i] - xs2[i];
xel2[0] = swe_radnorm(xel2[0]);
if (xel2[0] > M_PI)
xel2[0] -= 2 * M_PI;
/* other values */
// cartesian coordinates of planet and sun
swi_polcart(xp2, x1);
swi_polcart(xs2, x2);
for (i = 0; i <= 2; i++)
x[i] = -x2[i] + x1[i];
/* 'apparent' hel. distance of planet*/
rphel = sqrt(square_sum(x));
// elongation of planet = angular distance of planet from sun
elong = acos((xs2[2] * xs2[2] + xp2[2] * xp2[2] - rphel * rphel) / 2.0 / xs2[2] / xp2[2]);
// this is equivalent to:
// elong = acos(swi_dot_prod_unit(x1, x2));
xang2[0] = elong;
if (rphel != 0 && ipl <= 4) {
if ((i = swe_pheno(te, ipl, iflag, attr, serr)) < 0) {
fprintf(stderr, "return code %d, mesg: %s\n", i, serr);
xma2[0] = 1;
} else {
xma2[0] = attr[4];
}
//fprintf(stderr, "mag1=%.7f\n", xma2[0]);
} else {
xma2[0] = 1;
}
if (istep >= 2) { /* now all of the arrays xp* and xs* are filled */
/* conjunctions with sun, in longitude */
if (do_flag & DO_LPHASE)
goto l_phase;
if (!(do_flag & DO_CONJ))
goto l_noconj;
if (sign_change(xel1[0] ,xel2[0])) {
double el0 = xel0[0], el1 = xel1[0], el2 = xel2[0];
if (el0 > M_PI / 2) el0 -= M_PI;
if (el0 < -M_PI / 2) el0 += M_PI;
if (el1 > M_PI / 2) el1 -= M_PI;
if (el1 < -M_PI / 2) el1 += M_PI;
if (el2 > M_PI / 2) el2 -= M_PI;
if (el2 < -M_PI / 2) el2 += M_PI;
nzer = find_zero(el0, el1, el2, tstep, &dt, &dt2);
if (nzer > 0) {
t2 = te + dt;
iflgret = swe_calc(t2, (int) ipl, iflag, x, serr);
iflgret = swe_calc(t2, SE_SUN, iflag, xs, serr);
is_opposition = 0;
if (ipl != SE_VENUS && ipl != SE_MERCURY) {
if (fabs(xel1[0]) > M_PI / 2) {
is_opposition = 1;
print_item("opposition", t2, x[0] * RADTODEG, x[1] * RADTODEG, HUGE);
} else
print_item("conjunction", t2, x[0] * RADTODEG, x[1] * RADTODEG, HUGE);
} else {
if (x[3] > 0)
print_item("superior conj", t2, x[0] * RADTODEG, x[1] * RADTODEG, HUGE);
else
print_item("inferior conj", t2, x[0] * RADTODEG, x[1] * RADTODEG, HUGE);
}
/* planet is behind solar disk or is transiting it */
for (j = 0, dt1 = tstep; j <= 5; j++, dt1 /= 3) {
for (k = 0; k <= 2; k++) {
switch(k) {
case 0:
t3 = t2 - dt1;
break;
case 1:
t3 = t2;
break;
case 2:
t3 = t2 + dt1;
break;
}
iflgret = swe_calc(t3, (int) ipl, iflag, xp, serr);
iflgret = swe_calc(t3, SE_SUN, iflag, xs, serr);
swi_polcart(xp, x1);
swi_polcart(xs, x2);
for (i = 0; i <= 2; i++)
x[i] = -x2[i] + x1[i];
rphel = sqrt(square_sum(x));
x0[k] = acos((xs[2] * xs[2] + xp[2] * xp[2] - rphel * rphel) /
2.0 / xs[2] / xp[2]);
}
find_maximum(x0[0], x0[1], x0[2], dt1, &dt, &xel);
t2 = t2 + dt1 + dt;
}
iflgret = swe_calc(t2, (int) ipl, iflag, x, serr);
iflgret = swe_calc(t2, SE_SUN, iflag, xs, serr);
/* minimum elongation of planet */
if (is_opposition) {
/*print_item(" maximum elong", t2, x[0] * RADTODEG, xel*RADTODEG, HUGE)*/;
} else {
print_item(" minimum elong", t2, x[0] * RADTODEG, xel*RADTODEG, HUGE);
}
switch(ipl) {
case SE_VENUS:
sunrad = SUN_RADIUS / xs[2] + VENUS_RADIUS / x[2];
break;
case SE_MERCURY:
sunrad = SUN_RADIUS / xs[2] + MERCURY_RADIUS / x[2];
break;
case SE_MARS:
default:
sunrad = SUN_RADIUS / xs[2] + MARS_RADIUS / x[2];
break;
}
if (sunrad > fabs(xel)) {
if (x[3] > 0 || ipl > SE_VENUS) {
strcpy(sout, " behind sun begin");
} else {
strcpy(sout, " transit begin");
print_item(" transit middle", t2, x[0] * RADTODEG, xel*RADTODEG, HUGE);
}
dt = sqrt(sunrad * sunrad - xel * xel);
/*dt = acos(cos(sunrad) / cos(xel)); is not better */
dt /= sqrt((x[3]-xs[3]) * (x[3]-xs[3]) + (x[4]-xs[4]) * (x[4]-xs[4]));
iflgret = swe_calc(t2-dt, (int) ipl, iflag, x, serr);
print_item(sout, t2 - dt, x[0] * RADTODEG, HUGE, HUGE);
if (x[3] > 0 || ipl > SE_VENUS)
strcpy(sout, " behind sun end");
else
strcpy(sout, " transit end");
iflgret = swe_calc(t2+dt, (int) ipl, iflag, x, serr);
print_item(sout, t2 + dt, x[0] * RADTODEG, HUGE, HUGE);
}
}
}
l_noconj:;
if (!(do_flag & DO_BRILL))
goto l_nobrill;
/* greatest brillancy */
if (ipl <= SE_MARS
&& xma0[0] > xma1[0]
&& xma2[0] > xma1[0]
&& xang1[0] > 10*DEGTORAD) {
find_maximum(xma0[0], xma1[0], xma2[0], tstep, &dt, &xma);
t2 = te + dt;
for (j = 0, dt1 = tstep; j <= 5; j++, dt1 /= 3) {
for (k = 0; k <= 2; k++) {
switch(k) {
case 0:
t3 = t2 - dt1;
break;
case 1:
t3 = t2;
break;
case 2:
t3 = t2 + dt1;
break;
}
//iflgret = swe_calc(t3, (int) ipl, iflag, xp, serr);
//iflgret = swe_calc(t3, SE_SUN, iflag, xs, serr);
//swi_polcart(xp, x1);
//swi_polcart(xs, x2);
//for (i = 0; i <= 2; i++)
// x[i] = -x2[i] + x1[i];
//rphel = sqrt(square_sum(x));
if ((i = swe_pheno(t3, ipl, iflag, attr, serr)) < 0) {
fprintf(stderr, "return code %d, mesg: %s\n", i, serr);
x0[k] = 1;
exit(0);
} else {
x0[k] = attr[4];
}
}
find_maximum(x0[0], x0[1], x0[2], dt1, &dt, &xma);
t2 = t2 + dt1 + dt;
}
iflgret = swe_calc(t2, (int) ipl, iflag, x, serr);
print_item("greatest brilliancy", t2, x[0] * RADTODEG, HUGE, xma);
}
l_nobrill:;
if (!(do_flag& DO_RISE) && !(do_flag & DO_ELONG))
goto l_noelong;
/* rise and set of morning and evening star
* This calculation is very simplistic. Exact dates are not possible
* because they depend on the geographic position of the observer.
*/
*sout = '\0';
magme[0] = magme[1] = magme[2] = 0;
switch(ipl) {
case SE_MERCURY:
magme[0] = xma0[0];
magme[1] = xma1[0];
magme[2] = xma2[0];
case SE_VENUS:
case SE_JUPITER:
elong_vis = 10;
break;
case SE_MOON:
case SE_MARS:
case SE_SATURN:
elong_vis = 15;
break;
default:
elong_vis = 15;
break;
}
if (xang1[0] * RADTODEG > elong_vis + magme[1]
&& xang2[0] * RADTODEG < elong_vis + magme[2]) {
if (xel1[0] > 0)
strcpy(sout, "evening set");
else
strcpy(sout, "morning set");
}
if (xang1[0] * RADTODEG < elong_vis + magme[1]
&& xang2[0] * RADTODEG > elong_vis + magme[2]) {
if (xel1[0] > 0)
strcpy(sout, "evening rise");
else
strcpy(sout, "morning rise");
}
if (*sout != '\0') {
x[0] = xang0[0] - elong_vis * DEGTORAD;
x[1] = xang1[0] - elong_vis * DEGTORAD;
x[2] = xang2[0] - elong_vis * DEGTORAD;
// with Mercury, brightness is taken into account
// (this method from Expl. Suppl. of AA 1984, however
// magnitudes used are from Swisseph >= 2.07)
if (ipl == SE_MERCURY) {
x[0] -= magme[0] * DEGTORAD;
x[1] -= magme[1] * DEGTORAD;
x[2] -= magme[2] * DEGTORAD;
}
}
if (!(do_flag & DO_RISE))
goto l_norise;
if (*sout != '\0') {
double cos_elong, deg_elong, derr;
if ((nzer = find_zero(x[0], x[1], x[2], tstep, &dt, &dt2)) > 0) {
t2 = te + dt;
/* some test code to verify actual elongation at found date */
iflgret = swe_calc(t2, (int) ipl, iflag, x2, serr);
iflgret = swe_calc(t2, SE_SUN, iflag, x1, serr);
cos_elong = cos(x2[0]-x1[0]) * cos(x2[1]-x1[1]);
deg_elong = acos(cos_elong) * RADTODEG;
derr = fabs(deg_elong) - elong_vis;
if (ipl == SE_MERCURY) {
//double xx1[6], xx2[6], rh;
double ma;
//swi_polcart(x2, xx2);
//swi_polcart(x1, xx1);
//for (i = 0; i <= 2; i++)
// x[i] = -xx1[i] + xx2[i];
/* 'apparent' hel. distance of planet*/
//rh = sqrt(square_sum(x));
if ((i = swe_pheno(t2, ipl, iflag, attr, serr)) < 0) {
fprintf(stderr, "return code %d, mesg: %s\n", i, serr);
exit(0);
}
ma = attr[4];
derr -= ma;
}
if (fabs(derr) > 0.01)
fprintf(stderr, "warning elongation planet %d test deviation %.3f arcsec at t=%f\n", ipl, derr * 3600, t2);
/* end test code */
print_item(sout, t2, x2[0] * RADTODEG, HUGE, HUGE);
}
}
l_norise:;
if (!(do_flag & DO_ELONG) || ipl >= SE_MARS)
goto l_noelong;
/* maximum elongation */
if (fabs(xang0[0]) < fabs(xang1[0]) && fabs(xang2[0]) < fabs(xang1[0])) {
find_maximum(xang0[0], xang1[0], xang2[0], tstep, &dt, &xel);
t2 = te + dt;
for (j = 0, dt1 = tstep; j <= 5; j++, dt1 /= 3) {
for (k = 0; k <= 2; k++) {
switch(k) {
case 0:
t3 = t2 - dt1;
break;
case 1:
t3 = t2;
break;
case 2:
t3 = t2 + dt1;
break;
}
iflgret = swe_calc(t3, (int) ipl, iflag, xp, serr);
iflgret = swe_calc(t3, SE_SUN, iflag, xs, serr);
swi_polcart(xp, x1);
swi_polcart(xs, x2);
for (i = 0; i <= 2; i++)
x[i] = -x2[i] + x1[i];
rphel = sqrt(square_sum(x));
x0[k] = acos((xs[2] * xs[2] + xp[2] * xp[2] - rphel * rphel) /
2.0 / xs[2] / xp[2]);
}
find_maximum(x0[0], x0[1], x0[2], dt1, &dt, &xel);
t2 = t2 + dt1 + dt;
}
iflgret = swe_calc(t2, (int) ipl, iflag, x, serr);
if (ipl > SE_VENUS)
strcpy(sout, "maximum elong.");
else if (xel1[0] > 0)
strcpy(sout, "evening max el");
else
strcpy(sout, "morning max el");
print_item(sout, t2, x[0] * RADTODEG, xel*RADTODEG, HUGE);
}