eli5 Why do we have different time zones around the world, and how do they work?

Question

eli5 Why do we have different time zones around the world, and how do they work?

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Answer 1

Because the Earth is round and rotating, the Sun cannot shine on all surfaces of the globe at the same time. The time zones try to follow the Sun’s rays through the day and night cycle so that morning and night correspond to roughly similar clock times around the world.