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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/>.
*/
/**
* The times of the day, by degree of darkness.
*/
enum darkness {
/**
* Not calculated yet.
*/
UNKNOWN = -1,
/**
* Hopefully, it is bright outside.
*/
DAYTIME = 0,
/**
* The sky is golden. The golden "hour".
* Also known as BMCT (dawn) or EECT (dusk).
*/
CIVIL_TWILIGHT = 1,
/**
* The sky is pink and blue.
*/
NAUTICAL_TWILIGHT = 2,
/**
* The sky is medium dark blue.
*/
ASTRONOMICAL_TWILIGHT = 3,
/**
* The sky is really dark blue.
*/
NIGHT = 4
};
/**
* 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);
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