56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
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/**
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* Header file for calculation
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*
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* @copyright 2012 Steffen Vogel
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* @license http://www.gnu.org/licenses/gpl.txt GNU Public License
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* @author Steffen Vogel <post@steffenvogel.de>
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* @link http://www.steffenvogel.de/2012/03/14/cron-jobs-fur-sonnenauf-untergang/
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*/
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/*
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* This file is part of sun
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*
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* sun 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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* any later version.
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*
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* sun 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 sun. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <time.h>
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#ifdef GEONAMES_SUPPORT
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#include "geonames.h"
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#else
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struct coords { double lat, lon; };
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#endif
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struct sun_coords { double dk, ra; };
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//#define DEBUG 1
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#define GEONAMES_SUPPORT 1
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#define M_2PI (M_PI * 2)
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enum mode { RISE, SET, NOON, DAYTIME, NIGHTTIME };
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/* helper function */
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void usage();
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double deg2rad(double deg);
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double rad2deg(double rad);
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double in_pi(double x);
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int julian_date(struct tm date);
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/* calculation functions */
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struct tm sun(struct coords pos, struct tm date, enum mode mode, double twilight, int timezone);
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struct sun_coords sun_pos(double days);
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double sun_eof(double days, double ra);
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double sun_eps(double days);
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