Meanwhile, the sun can only illuminate half of the earth's surface. Half a day, half a day.

Yo, with the alternation of day and night, the ground temperature will not be too high during the day and too low at night, which is beneficial to the survival and development of life on earth.

Second, local time.

Know the division of time zones: divide a time zone every longitude 15; Based on the 0 meridian, the time zone is from 7.5 W to 7.5° E；; To the east of the central time zone is the east 1 zone to the east 12 zone, and the west 1 zone to the west 12 zone. The east and west zones are combined into one time zone. Each time zone takes the central meridian as the local time zone.

Third, the geostrophic deflection force

The northern hemisphere leans to the right and the southern hemisphere leans to the left, not to the equator.