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/* solar.h */
#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 */
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