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/**
* Copyright © 2016 Mattias Andrée <maandree@member.fsf.org>
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "state.h"
#include "solar.h"
/**
* Is it daytime, night, perhaps some kind of twilight?
*
* @param elevation The Sun's apparent elevation.
* @return The time of the day.
*/
enum darkness
get_darkness(double elevation)
{
if (elevation > SOLAR_ELEVATION_SUNSET_SUNRISE) return DAYTIME;
if (elevation > SOLAR_ELEVATION_CIVIL_DUSK_DAWN) return CIVIL_TWILIGHT;
if (elevation > SOLAR_ELEVATION_NAUTICAL_DUSK_DAWN) return NAUTICAL_TWILIGHT;
if (elevation > SOLAR_ELEVATION_ASTRONOMICAL_DUSK_DAWN) return ASTRONOMICAL_TWILIGHT;
return NIGHT;
}
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