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/*
* The MIT License (MIT)
*
* Copyright (c) 2015 Derick Rethans
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/* This macro computes the length of the day, from sunrise to sunset. */
/* Sunrise/set is considered to occur when the Sun's upper limb is */
/* 35 arc minutes below the horizon (this accounts for the refraction */
/* of the Earth's atmosphere). */
#define day_length(year,month,day,lon,lat) \
__daylen__( year, month, day, lon, lat, -35.0/60.0, 1 )
/* This macro computes the length of the day, including civil twilight. */
/* Civil twilight starts/ends when the Sun's center is 6 degrees below */
/* the horizon. */
#define day_civil_twilight_length(year,month,day,lon,lat) \
__daylen__( year, month, day, lon, lat, -6.0, 0 )
/* This macro computes the length of the day, incl. nautical twilight. */
/* Nautical twilight starts/ends when the Sun's center is 12 degrees */
/* below the horizon. */
#define day_nautical_twilight_length(year,month,day,lon,lat) \
__daylen__( year, month, day, lon, lat, -12.0, 0 )
/* This macro computes the length of the day, incl. astronomical twilight. */
/* Astronomical twilight starts/ends when the Sun's center is 18 degrees */
/* below the horizon. */
#define day_astronomical_twilight_length(year,month,day,lon,lat) \
__daylen__( year, month, day, lon, lat, -18.0, 0 )
/* This macro computes times for sunrise/sunset. */
/* Sunrise/set is considered to occur when the Sun's upper limb is */
/* 35 arc minutes below the horizon (this accounts for the refraction */
/* of the Earth's atmosphere). */
#define timelib_astro_sun_rise_set(ts,lon,lat,hrise,hset,rise,set) \
timelib_astro_rise_set_altitude( ts, lon, lat, -35.0/60.0, 1, hrise, hset, rise, set )
/* This macro computes the start and end times of civil twilight. */
/* Civil twilight starts/ends when the Sun's center is 6 degrees below */
/* the horizon. */
#define civil_twilight(ts,lon,lat,start,end) \
timelib_astro_rise_set_altitude( ts, lon, lat, -6.0, 0, start, end )
/* This macro computes the start and end times of nautical twilight. */
/* Nautical twilight starts/ends when the Sun's center is 12 degrees */
/* below the horizon. */
#define nautical_twilight(ts,lon,lat,start,end) \
timelib_astro_rise_set_altitude( ts, lon, lat, -12.0, 0, start, end )
/* This macro computes the start and end times of astronomical twilight. */
/* Astronomical twilight starts/ends when the Sun's center is 18 degrees */
/* below the horizon. */
#define astronomical_twilight(ts,lon,lat,start,end) \
timelib_astro_rise_set_altitude( ts, lon, lat, -18.0, 0, start, end )
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