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75 lines
2.6 KiB
C
75 lines
2.6 KiB
C
/*
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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 Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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Copyright (C) 2003 Liam Girdwood <liam@gnova.org>
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A simple example showing some solar calculations.
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*/
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#include <ctype.h>
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#include <errno.h>
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#include <libgen.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <libnova/solar.h>
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#include <libnova/julian_day.h>
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#include <libnova/rise_set.h>
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#include <libnova/transform.h>
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static const double horizons[] = {LN_SOLAR_STANDART_HORIZON, LN_SOLAR_CIVIL_HORIZON, LN_SOLAR_NAUTIC_HORIZON, LN_SOLAR_ASTRONOMICAL_HORIZON};
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static const char *hnames[] = {"standard", "civil", "nautic", "astro"};
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int main (int argc, char **argv){
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struct ln_equ_posn equ;
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struct ln_rst_time rst;
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struct ln_zonedate rise;
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struct ln_lnlat_posn observer;
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double JD, angle = LN_SOLAR_ASTRONOMICAL_HORIZON;
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time_t t;
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if(argc == 2){
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if(isdigit(*argv[1])) angle = -atof(argv[1]); // angle value
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else{ // angle name
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for(int i = 0; i < sizeof(horizons)/sizeof(double); ++i){
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if(strcasecmp(argv[1], hnames[i]) == 0){
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angle = horizons[i];
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break;
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}
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}
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}
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}else if(argc > 2){
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fprintf(stderr, "Usage: %s [positive angle in degr] OR %s [\"standard\"|\"civil\"|\"nautic\"|\"astro\"]\n",
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program_invocation_short_name, program_invocation_short_name);
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return 1;
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}
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observer.lat = 43.653528;
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observer.lng = 41.4414375;
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JD = ln_get_julian_from_sys();
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ln_get_solar_equ_coords (JD, &equ);
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if(ln_get_solar_rst_horizon(JD, &observer, angle, &rst) == 1) return 1;
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if(strcasecmp(program_invocation_short_name, "sunrise") == 0)
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ln_get_timet_from_julian(rst.rise, &t);
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else if(strcasecmp(program_invocation_short_name, "sunset") == 0)
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ln_get_timet_from_julian(rst.set, &t);
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else
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ln_get_timet_from_julian(rst.transit, &t);
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printf("%zd\n", t);
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return 0;
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}
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