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85 lines
3.2 KiB
C
85 lines
3.2 KiB
C
/*
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* This file is part of the ERFA project.
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* Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <time.h>
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#include <usefull_macros.h>
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#include "astrotools.h"
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static at_string_t *S = NULL;
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static const char *radtohrs(double r){
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if(!S) S = at_newstring(256);
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if(!at_radtoHtime(r, S)) ERRX("at_radtoHtime");
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return S->str;
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}
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static const char *radtodeg(double r){
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if(!S) S = at_newstring(256);
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if(!at_radtoHdeg(r, S)) ERRX("at_radtoHdeg");
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return S->str;
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}
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int main(){
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initial_setup();
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at_MJD_t mjd;
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if(!at_get_MJDu(time(NULL), &mjd)) ERRX("at_get_MJDu");
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printf("MJD=%g; TAI=%g/%g, TT=%g/%g, UTC=%g/%g\n", mjd.MJD, mjd.tai1, mjd.tai2, mjd.tt1, mjd.tt2, mjd.utc1, mjd.utc2);
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double ST = at_get_LST(&mjd);
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if(ST < 0.) ERRX("at_get_LST");
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printf("ST = %s\n", radtohrs(ST));
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at_horiz_t htest = {.az = ERFA_DD2R*91., .zd = ERFA_DPI/4.}; // Z=45degr, A=1degr from south to west
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printf("hzd=%g\n", htest.zd);
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at_equat_t ptest;
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at_hor2eq(&htest, &ptest, ST);
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printf("A=%s, ", radtodeg(htest.az));
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printf("Z=%s; ", radtodeg(htest.zd));
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printf("HOR->EQ: HA=%s, ", radtohrs(ptest.ha));
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printf("RA=%s, ", radtohrs(ptest.ra));
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printf("DEC=%s\n", radtodeg(ptest.dec));
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at_horiz_t h2;
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at_eq2hor(&ptest, &h2);
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printf("Back conversion EQ->HOR: A=%s, ", radtodeg(h2.az));
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printf("Z=%s\n", radtodeg(h2.zd));
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at_equat_t pnow;
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if(!at_get_ObsPlace(&mjd, &ptest, &pnow, &h2)) ERRX("at_get_ObsPlace");
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printf("\nApparent place, RA=%s, ", radtohrs(pnow.ra-pnow.eo));
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printf("HA=%s, ", radtohrs(pnow.ha));
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printf("ST-RA=%s, ", radtohrs(ST-pnow.ra+pnow.eo));
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printf("DEC=%s; ", radtodeg(pnow.dec));
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printf("A=%s, ", radtodeg(h2.az));
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printf("Z=%s\n", radtodeg(h2.zd));
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at_hor2eq(&h2, &ptest, ST);
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printf("\tHOR->EQ: RA=%s, ", radtohrs(ptest.ra-ptest.eo));
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printf("HA=%s, ", radtohrs(ptest.ha));
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printf("ST-RA=%s, ", radtohrs(ST-ptest.ra+ptest.eo));
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printf("DEC=%s\n", radtodeg(ptest.dec));
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at_eq2hor(&pnow, &h2);
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printf("\tEQ->HOR: A=%s, ", radtodeg(h2.az));
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printf("Z=%s\n", radtodeg(h2.zd));
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if(!at_get_mean(&mjd, &pnow, &ptest)) ERRX("at_get_mean");
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printf("\nBack conversion pnow to mean place, ");
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printf("RA=%s, ", radtohrs(ptest.ra));
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printf("Dec=%s\n", radtodeg(ptest.dec));
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if(!at_obs2catP(&mjd, &pnow, &ptest)) ERRX("at_obs2catP");
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printf("And back to J2000 by observed pnow: ");
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printf("RA=%s, ", radtohrs(ptest.ra));
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printf("Dec=%s\n", radtodeg(ptest.dec));
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return 0;
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}
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