69 lines
3.1 KiB
C
69 lines
3.1 KiB
C
/*
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* Stairs lighting
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* Copyright 2017 (c) Mark van Renswoude
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*
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* https://git.x2software.net/pub/Stairs
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*
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* This code was ported over from Domoticz' SunRiseSet.cpp
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* https://github.com/domoticz/domoticz/
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*/
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#ifndef __praisethesun
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#define __praisethesun
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double daylen( int year, int month, int day, double lon, double lat, double altit, int upper_limb );
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int sunriset( int year, int month, int day, double lon, double lat,
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double altit, int upper_limb, double *trise, double *tset );
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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 sun_rise_set(year,month,day,lon,lat,rise,set) \
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sunriset( year, month, day, lon, lat, -35.0/60.0, 1, 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(year,month,day,lon,lat,start,end) \
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sunriset( year, month, day, 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(year,month,day,lon,lat,start,end) \
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sunriset( year, month, day, 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(year,month,day,lon,lat,start,end) \
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sunriset( year, month, day, lon, lat, -18.0, 0, start, end )
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#endif |