When does it get dark in winter?

In China, the northern hemisphere, the sunset in winter is before 18. It depends on what latitude you are in, south or north, east or west. As for the number of sunsets, it depends on your geographical location.

1, day length = sunset time-sunrise time; Length of day =24 hours-length of night

Sunrise time = 12:00- day length /2 (or 0:00+ night length/2); The sunrise time at that point on the equator is 6 o'clock.

Sunset time = 12:00+ day length /2 (or 24:00- night length/2); The sunset time at this point on the equator is 18: 00.

2. Time distribution of the length of day and night:

(1) In which hemisphere is the direct sunlight point, which hemisphere has long days and short nights. In the northern hemisphere in summer, the direct sunlight point is in the northern hemisphere, with long days and short nights.

(2) Which hemisphere the direct point of the sun moves to, the daytime in this hemisphere will become longer, and the daytime in the northern hemisphere is the longest on June 22nd, and the shortest on June 22nd, 65438+February 22nd.

③ The maximum day length between the Tropic of Cancer and the maximum noon sun height angle do not appear on the same day, such as Haikou City.

3. Latitude distribution in day and night:

In summer in the northern hemisphere, the days are long and the nights are short, and the days are longer as you go north (the earlier the sunrise is, the later it is), such as Beijing > Shanghai > Guangzhou.

In winter in the northern hemisphere, the days are short and the nights are long. The farther south, the longer the day (the earlier the sunrise, the later the sunset). Such as Haikou > Guangzhou > Shanghai,