In the case of sunny weather. How long does it take from dark to dawn?

The nights in the four seasons are different in length. Day and night are generated by rotation, which is called "solar day", but the length of day and night is not equal to the rotation period, because the earth rotates once, which changes the relative angle between the earth and the sun. Day and night are viewed from the range where the sun shines on the earth, so one day and night is 3 minutes and 56 seconds longer than the rotation period. When the earth rotates, the ground facing the sun is "daytime" and the ground facing away from the sun is "night".

Calculation of sunshine time: the effective sunshine time is determined according to the building orientation (see the table below). If the orientation angle of the building exceeds the angle range specified in the effective sunshine schedule, the sunshine analysis will not be carried out. Effective time table for sunshine: Effective time for sunshine towards the building. The effective sunshine hours of buildings are due south at 9: 00 ~ 15: 00, south east 1 ~ 15 9: 00 ~15: 00, and south west1~159.

South east 16 ~ 30 9: 00 ~ 14: 30 south west 16 ~ 30 9: 30 ~ 15: 00 south east 3 1 ~ 45 9: 00 ~ 65. 6 ~ 60 9: 00 ~ 12: 30 southwest 46 ~ 601:30 ~15: 00 southeast 6 1 ~ 75 9: 00 ~ 65438. East 76 ~ 90 9: 00 ~ 10: 30 southwest 76 ~ 90 13: 30 ~ 15: 00 note: the azimuth is an integer, and the decimal point is rounded off. In addition, the source of these data needs to be determined. On a global scale, it is necessary to re-determine the specific sunshine time according to the specific geographical location, namely latitude and longitude. It should be possible to deduce the latitude and longitude of the above data.