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/* solar.h -- Solar position header
This file is part of redshift-ng.
redshift-ng 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-ng 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-ng. If not, see <http://www.gnu.org/licenses/>.
Copyright (c) 2010 Jon Lund Steffensen <jonlst@gmail.com>
*/
#ifndef REDSHIFT_SOLAR_H
#define REDSHIFT_SOLAR_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)
enum solar_time {
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
};
double solar_elevation(double date, double lat, double lon);
void solar_table_fill(double date, double lat, double lon, double *table);
#endif /* ! REDSHIFT_SOLAR_H */
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