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Annotation of embedaddon/php/ext/date/lib/astro.h, revision 1.1.1.1

1.1       misho       1: /* This macro computes the length of the day, from sunrise to sunset. */
                      2: /* Sunrise/set is considered to occur when the Sun's upper limb is    */
                      3: /* 35 arc minutes below the horizon (this accounts for the refraction */
                      4: /* of the Earth's atmosphere).                                        */
                      5: #define day_length(year,month,day,lon,lat)  \
                      6:         __daylen__( year, month, day, lon, lat, -35.0/60.0, 1 )
                      7: 
                      8: /* This macro computes the length of the day, including civil twilight. */
                      9: /* Civil twilight starts/ends when the Sun's center is 6 degrees below  */
                     10: /* the horizon.                                                         */
                     11: #define day_civil_twilight_length(year,month,day,lon,lat)  \
                     12:         __daylen__( year, month, day, lon, lat, -6.0, 0 )
                     13: 
                     14: /* This macro computes the length of the day, incl. nautical twilight.  */
                     15: /* Nautical twilight starts/ends when the Sun's center is 12 degrees    */
                     16: /* below the horizon.                                                   */
                     17: #define day_nautical_twilight_length(year,month,day,lon,lat)  \
                     18:         __daylen__( year, month, day, lon, lat, -12.0, 0 )
                     19: 
                     20: /* This macro computes the length of the day, incl. astronomical twilight. */
                     21: /* Astronomical twilight starts/ends when the Sun's center is 18 degrees   */
                     22: /* below the horizon.                                                      */
                     23: #define day_astronomical_twilight_length(year,month,day,lon,lat)  \
                     24:         __daylen__( year, month, day, lon, lat, -18.0, 0 )
                     25: 
                     26: 
                     27: /* This macro computes times for sunrise/sunset.                      */
                     28: /* Sunrise/set is considered to occur when the Sun's upper limb is    */
                     29: /* 35 arc minutes below the horizon (this accounts for the refraction */
                     30: /* of the Earth's atmosphere).                                        */
                     31: #define timelib_astro_sun_rise_set(ts,lon,lat,hrise,hset,rise,set)  \
                     32:         timelib_astro_rise_set_altitude( ts, lon, lat, -35.0/60.0, 1, hrise, hset, rise, set )
                     33: 
                     34: /* This macro computes the start and end times of civil twilight.       */
                     35: /* Civil twilight starts/ends when the Sun's center is 6 degrees below  */
                     36: /* the horizon.                                                         */
                     37: #define civil_twilight(ts,lon,lat,start,end)  \
                     38:         timelib_astro_rise_set_altitude( ts, lon, lat, -6.0, 0, start, end )
                     39: 
                     40: /* This macro computes the start and end times of nautical twilight.    */
                     41: /* Nautical twilight starts/ends when the Sun's center is 12 degrees    */
                     42: /* below the horizon.                                                   */
                     43: #define nautical_twilight(ts,lon,lat,start,end)  \
                     44:         timelib_astro_rise_set_altitude( ts, lon, lat, -12.0, 0, start, end )
                     45: 
                     46: /* This macro computes the start and end times of astronomical twilight.   */
                     47: /* Astronomical twilight starts/ends when the Sun's center is 18 degrees   */
                     48: /* below the horizon.                                                      */
                     49: #define astronomical_twilight(ts,lon,lat,start,end)  \
                     50:         timelib_astro_rise_set_altitude( ts, lon, lat, -18.0, 0, start, end )
                     51: