Knowing the direct point of the sun, how to calculate the length of day and night? Give me some examples.

Ha ha! I thought about this problem in high school and analyzed it carefully. I summed up a formula that can solve your problem.

This formula can be used to calculate the sunshine time at any latitude at the direct point of the sun. The formula is as follows:

When the direct point of the sun is at any latitude, the sunshine time at any latitude =0.5(tanAtanB+ 1)*24h.

Where a is the latitude where the direct point of the sun is located, with positive north latitude and negative south latitude. B is the latitude of the location, with positive north latitude and negative south latitude.

The derivation of this formula is very complicated, and trigonometric functions should be widely used.

Finally, I hope to give more points! This can really be called blood and sweat!