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author | Joey Castillo <joeycastillo@utexas.edu> | 2022-01-15 19:21:39 -0500 |
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committer | Joey Castillo <joeycastillo@utexas.edu> | 2022-01-15 19:23:49 -0500 |
commit | baf25aaa7a7f8ff673bbe805963b242c0eb52306 (patch) | |
tree | 80124eb866f4b66153244dd9c1763a4f81efbf29 /movement/lib/sunriset/sunriset.h | |
parent | 41eaa9c1c03ee70179d8c37c20b436b11dafb8ef (diff) | |
download | Sensor-Watch-baf25aaa7a7f8ff673bbe805963b242c0eb52306.tar.gz Sensor-Watch-baf25aaa7a7f8ff673bbe805963b242c0eb52306.tar.bz2 Sensor-Watch-baf25aaa7a7f8ff673bbe805963b242c0eb52306.zip |
movement: add sunrise/sunset face
Diffstat (limited to 'movement/lib/sunriset/sunriset.h')
-rw-r--r-- | movement/lib/sunriset/sunriset.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/movement/lib/sunriset/sunriset.h b/movement/lib/sunriset/sunriset.h new file mode 100644 index 00000000..f8b97e32 --- /dev/null +++ b/movement/lib/sunriset/sunriset.h @@ -0,0 +1,95 @@ +/* + +SUNRISET.H - computes Sun rise/set times, start/end of twilight, and + the length of the day at any date and latitude + +Written as DAYLEN.C, 1989-08-16 + +Modified to SUNRISET.C, 1992-12-01 + +(c) Paul Schlyter, 1989, 1992 + +Released to the public domain by Paul Schlyter, December 1992 + +*/ + +#ifndef SUNRISET_H_ +#define SUNRISET_H_ + +/* Function prototypes */ + +double __daylen__( int year, int month, int day, double lon, double lat, + double altit, int upper_limb ); + +int __sunriset__( int year, int month, int day, double lon, double lat, + double altit, int upper_limb, double *rise, double *set ); + +void sunpos( double d, double *lon, double *r ); + +void sun_RA_dec( double d, double *RA, double *dec, double *r ); + +double revolution( double x ); + +double rev180( double x ); + +double GMST0( double d ); + + +/* Following are some macros around the "workhorse" function __daylen__ */ +/* They mainly fill in the desired values for the reference altitude */ +/* below the horizon, and also selects whether this altitude should */ +/* refer to the Sun's center or its upper limb. */ + + +/* 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 sun_rise_set(year,month,day,lon,lat,rise,set) \ + __sunriset__( year, month, day, lon, lat, -35.0/60.0, 1, 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(year,month,day,lon,lat,start,end) \ + __sunriset__( year, month, day, 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(year,month,day,lon,lat,start,end) \ + __sunriset__( year, month, day, 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(year,month,day,lon,lat,start,end) \ + __sunriset__( year, month, day, lon, lat, -18.0, 0, start, end ) + +#endif // SUNRISET_H_ |