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https://github.com/cosinekitty/astronomy.git
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743c11b7fc
Moved the following constant definitions from astronomy.c to astronomy.h, so external code can use them: DEG2RAD RAD2DEG KM_PER_AU My custom doxygen-to-markdown translator (hydrogen.js) now emits markdown for the above constants. Eliminated the obsolete constants MIN_YEAR and MAX_YEAR. Astronomy Engine is no longer limited to calculating planets within that range of years. Fixed a couple of minor documentation issues in the C code. Started work on a new function Astronomy_ObserverVector, but it is just a stub for now.
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
/*
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seasons.c - Don Cross - 2019-06-16
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Example C program for Astronomy Engine:
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https://github.com/cosinekitty/astronomy
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This program demonstrates how to calculate the
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equinoxes and solstices for a year.
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*/
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#include <stdio.h>
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#include "astro_demo_common.h"
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void Print(const char *name, astro_time_t time)
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{
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printf("%-17s : ", name);
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PrintTime(time);
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printf("\n");
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}
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int main(int argc, const char *argv[])
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{
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int year;
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astro_seasons_t seasons;
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if (argc != 2)
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{
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fprintf(stderr, "USAGE: seasons year\n");
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return 1;
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}
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if (1 != sscanf(argv[1], "%d", &year))
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{
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fprintf(stderr, "ERROR: Invalid year '%s'.\n", argv[1]);
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return 1;
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}
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seasons = Astronomy_Seasons(year);
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if (seasons.status != ASTRO_SUCCESS)
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{
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fprintf(stderr, "ERROR: Astronomy_Seasons() returned %d\n", seasons.status);
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return 1;
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}
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Print("March equinox", seasons.mar_equinox);
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Print("June solstice", seasons.jun_solstice);
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Print("September equinox", seasons.sep_equinox);
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Print("December solstice", seasons.dec_solstice);
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return 0;
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}
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