2015-09-22 07:41:56 +00:00
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/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2015 Derick Rethans
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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2005-12-19 12:57:49 +00:00
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/* This macro computes the length of the day, from sunrise to sunset. */
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/* Sunrise/set is considered to occur when the Sun's upper limb is */
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/* 35 arc minutes below the horizon (this accounts for the refraction */
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/* of the Earth's atmosphere). */
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#define day_length(year,month,day,lon,lat) \
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__daylen__( year, month, day, lon, lat, -35.0/60.0, 1 )
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/* This macro computes the length of the day, including civil twilight. */
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/* Civil twilight starts/ends when the Sun's center is 6 degrees below */
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/* the horizon. */
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#define day_civil_twilight_length(year,month,day,lon,lat) \
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__daylen__( year, month, day, lon, lat, -6.0, 0 )
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/* This macro computes the length of the day, incl. nautical twilight. */
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/* Nautical twilight starts/ends when the Sun's center is 12 degrees */
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/* below the horizon. */
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#define day_nautical_twilight_length(year,month,day,lon,lat) \
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__daylen__( year, month, day, lon, lat, -12.0, 0 )
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/* This macro computes the length of the day, incl. astronomical twilight. */
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/* Astronomical twilight starts/ends when the Sun's center is 18 degrees */
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/* below the horizon. */
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#define day_astronomical_twilight_length(year,month,day,lon,lat) \
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__daylen__( year, month, day, lon, lat, -18.0, 0 )
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/* This macro computes times for sunrise/sunset. */
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/* Sunrise/set is considered to occur when the Sun's upper limb is */
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/* 35 arc minutes below the horizon (this accounts for the refraction */
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/* of the Earth's atmosphere). */
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#define timelib_astro_sun_rise_set(ts,lon,lat,hrise,hset,rise,set) \
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timelib_astro_rise_set_altitude( ts, lon, lat, -35.0/60.0, 1, hrise, hset, rise, set )
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/* This macro computes the start and end times of civil twilight. */
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/* Civil twilight starts/ends when the Sun's center is 6 degrees below */
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/* the horizon. */
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#define civil_twilight(ts,lon,lat,start,end) \
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timelib_astro_rise_set_altitude( ts, lon, lat, -6.0, 0, start, end )
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/* This macro computes the start and end times of nautical twilight. */
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/* Nautical twilight starts/ends when the Sun's center is 12 degrees */
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/* below the horizon. */
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#define nautical_twilight(ts,lon,lat,start,end) \
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timelib_astro_rise_set_altitude( ts, lon, lat, -12.0, 0, start, end )
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/* This macro computes the start and end times of astronomical twilight. */
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/* Astronomical twilight starts/ends when the Sun's center is 18 degrees */
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/* below the horizon. */
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#define astronomical_twilight(ts,lon,lat,start,end) \
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timelib_astro_rise_set_altitude( ts, lon, lat, -18.0, 0, start, end )
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