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Diffstat (limited to 'src/solar.h')
| -rw-r--r-- | src/solar.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/src/solar.h b/src/solar.h new file mode 100644 index 0000000..5897373 --- /dev/null +++ b/src/solar.h @@ -0,0 +1,50 @@ +/* solar.h -- Solar position header + This file is part of Redshift. + + Redshift is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + Redshift is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with Redshift. If not, see <http://www.gnu.org/licenses/>. + + Copyright (c) 2009 Jon Lund Steffensen <jonlst@gmail.com> +*/ + +#ifndef _SOLAR_H +#define _SOLAR_H + +#include <time.h> + +/* Model of atmospheric refraction near horizon (in degrees). */ +#define SOLAR_ATM_REFRAC 0.833 + +#define SOLAR_ASTRO_TWILIGHT_ELEV -18.0 +#define SOLAR_NAUT_TWILIGHT_ELEV -12.0 +#define SOLAR_CIVIL_TWILIGHT_ELEV -6.0 +#define SOLAR_DAYTIME_ELEV (0.0 - SOLAR_ATM_REFRAC) + +typedef enum { + SOLAR_TIME_NOON = 0, + SOLAR_TIME_MIDNIGHT, + SOLAR_TIME_ASTRO_DAWN, + SOLAR_TIME_NAUT_DAWN, + SOLAR_TIME_CIVIL_DAWN, + SOLAR_TIME_SUNRISE, + SOLAR_TIME_SUNSET, + SOLAR_TIME_CIVIL_DUSK, + SOLAR_TIME_NAUT_DUSK, + SOLAR_TIME_ASTRO_DUSK, + SOLAR_TIME_MAX +} solar_time_t; + +double solar_elevation(time_t t, double lat, double lon); +void solar_table_fill(time_t date, double lat, double lon, time_t *table); + +#endif /* ! _SOLAR_H */ |