From 4818f331cedeba94bb769fb15fd972dc759fd31f Mon Sep 17 00:00:00 2001 From: Jon Lund Steffensen Date: Wed, 4 Nov 2009 20:18:31 +0100 Subject: Initial import. --- solar.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 solar.h (limited to 'solar.h') diff --git a/solar.h b/solar.h new file mode 100644 index 0000000..dc6e513 --- /dev/null +++ b/solar.h @@ -0,0 +1,33 @@ +/* solar.h */ + +#ifndef _SOLAR_H +#define _SOLAR_H + +#include + +/* 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 */ -- cgit v1.2.3-70-g09d2