51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/* solar.h -- Solar position header
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This file is part of Redshift.
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Redshift 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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Redshift 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 Redshift. If not, see <http://www.gnu.org/licenses/>.
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Copyright (c) 2009 Jon Lund Steffensen <jonlst@gmail.com>
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*/
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#ifndef _SOLAR_H
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#define _SOLAR_H
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#include <time.h>
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/* Model of atmospheric refraction near horizon (in degrees). */
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#define SOLAR_ATM_REFRAC 0.833
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#define SOLAR_ASTRO_TWILIGHT_ELEV -18.0
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#define SOLAR_NAUT_TWILIGHT_ELEV -12.0
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#define SOLAR_CIVIL_TWILIGHT_ELEV -6.0
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#define SOLAR_DAYTIME_ELEV (0.0 - SOLAR_ATM_REFRAC)
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typedef enum {
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SOLAR_TIME_NOON = 0,
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SOLAR_TIME_MIDNIGHT,
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SOLAR_TIME_ASTRO_DAWN,
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SOLAR_TIME_NAUT_DAWN,
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SOLAR_TIME_CIVIL_DAWN,
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SOLAR_TIME_SUNRISE,
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SOLAR_TIME_SUNSET,
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SOLAR_TIME_CIVIL_DUSK,
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SOLAR_TIME_NAUT_DUSK,
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SOLAR_TIME_ASTRO_DUSK,
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SOLAR_TIME_MAX
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} solar_time_t;
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double solar_elevation(time_t t, double lat, double lon);
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void solar_table_fill(time_t date, double lat, double lon, time_t *table);
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#endif /* ! _SOLAR_H */
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