Question

What causes day and night on Earth?

Answer 1

Earth rotates about its polar axis, periodically, with period 24 h, nearly. Relatively, Sun moves from sunrise to sunset, in `about` 12 hours, for day,. leaving the remaining hours for night.

Explanation:

It is day for Sun-facing hemisphere,and, at the same time, it is dark

over the opposite hemisphere..

Earth's periodical spin about its polar axis that is inclined at

`23.4 ^o` to the normal to the Earth's orbital plane, with period 24

h, nearly, causes day and night..

Relative to the Earth, Sun moves, from sunrise to sunset, in `about` 12

hours for day. leaving the remaining hours for night.

The latitude of the place, the obliquity `23.4^o` and the day of the

year determine the duration of daytime, every day.

At either pole, the daytime would vary, from 0 to 24 h, during a year.