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128 lines
3.8 KiB
C
128 lines
3.8 KiB
C
/*
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* This file is part of the astrotools 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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#pragma once
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#include <erfa.h>
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#include <erfam.h>
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#include <libnova/libnova.h>
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#include <sys/time.h>
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#include <time.h>
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#ifndef FALSE
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#define FALSE (0)
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#endif
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#ifndef TRUE
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#define TRUE (1)
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#endif
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#ifndef ERFA_DR2S
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#define ERFA_DR2S 1.3750987083139757010431557155385240879777313391975e4
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#endif
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typedef struct{
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double utc1; double utc2; // UTC JD, commonly used MJD = utc1+utc2-2400000.5
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double MJD;
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double tai1; double tai2; // TAI JD
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double tt1; double tt2; // TT JD
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} at_MJD_t;
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// equatorial coordinates & equation of origins (all in radians)
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typedef struct{
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double ha; // hour angle
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double ra; // right ascencion
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double dec; // declination
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double eo; // equation of origins
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} at_equat_t;
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// horizontal coordinates (all in radians)
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typedef struct{
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double az; // azimuth, 0 @ south, positive clockwise
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double zd; // zenith distance
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} at_horiz_t;
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// observational place coordinates and altitude; all angle coordinates are in radians!
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typedef struct{
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double longitude; // longitude
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double latitude; // latitude
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double altitude; // altitude, m
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} at_place_t;
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// place weather data
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typedef struct{
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double relhum; // rel. humidity, 0..1
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double phpa; // atm. pressure (hectopascales)
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double tdegc; // temperature, degrC
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} at_weather_t;
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// DUT/polar almanach data
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typedef struct{
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double DUT1; // UT1-UTC, sec
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double px; // polar coordinates, arcsec
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double py;
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} at_dut_t;
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typedef struct{
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char *str;
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size_t maxlen;
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size_t strlen;
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} at_string_t;
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typedef struct{
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double pmRA; // proper motion (radians/year)
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double pmDec;
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double parallax; // (arcsec)
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double radvel; // radial velocity (km/s, positive if receding)
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} at_star_t;
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int at_getPlace(at_place_t *p);
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int at_setPlace(at_place_t *p);
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int at_getWeath(at_weather_t *w);
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int at_setWeath(at_weather_t *w);
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int at_getDUT(at_dut_t *a);
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int at_setDUT(at_dut_t *a);
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void at_setEffWvl(double w);
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// strings
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int at_chkstring(at_string_t *s, size_t minlen);
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at_string_t *at_newstring(size_t maxlen);
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void at_delstring(at_string_t **s);
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const char *at_libversion();
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// human readable
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int at_radtoHdeg(double r, at_string_t *s);
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int at_radtoHtime(double r, at_string_t *s);
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// time-date
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int at_get_MJDt(struct timeval *tval, at_MJD_t *mjd);
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int at_get_MJDu(double UNIXtime, at_MJD_t *mjd);
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int at_get_MJDj(double JD, at_MJD_t *mjd);
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double at_get_LST(at_MJD_t *mjd);
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// coordinates
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void at_hor2eq(at_horiz_t *h, at_equat_t *pc, double LST);
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void at_eq2hor(at_equat_t *pc, at_horiz_t *h);
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double at_getRA(at_equat_t *pc, double LST);
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double at_getHA(at_equat_t *pc, double LST);
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int at_get_ObsPlace(at_MJD_t *MJD, at_equat_t *p2000, at_equat_t *pnow, at_horiz_t *hnow);
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int at_get_ObsPlaceStar(at_MJD_t *MJD, at_equat_t *p2000, at_star_t *star, at_equat_t *pnow, at_horiz_t *hnow);;
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int at_get_mean(at_MJD_t *MJD, at_equat_t *pnow, at_equat_t *p2000);
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int at_obs2catP(at_MJD_t *MJD, at_equat_t *pnow, at_equat_t *p2000);
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int at_obs2catA(at_MJD_t *MJD, at_horiz_t *hnow, at_equat_t *p2000);
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