From 03dcd5d78a8cd5a9706f174f32cdfe8649272904 Mon Sep 17 00:00:00 2001 From: Jon Lund Steffensen Date: Wed, 23 Dec 2009 17:33:17 +0100 Subject: Move source and headers to src dir. --- src/solar.h | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 src/solar.h (limited to 'src/solar.h') 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 . + + Copyright (c) 2009 Jon Lund Steffensen +*/ + +#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