Which of earth's motions is responsible for day/night and how does day occur on one hemisphere and night on another?

1 Answer

Self rotation of earth once in 2 4 hours(Exactly 23 hours 56 minutes and 4 seconds) is responsible for day/nights.

Explanation:

Normally hemisphere is used to divide Earth into two parts north and south of equator.enter image source here
Earth is a sphere.When sun light strike from one side 50% of its surface is lit by sun light where we have day. Other 50% is night.
Picture credit Thunderboltkids.Co.Zh.