The temperature around earth's equator stays about the same throughout the year. why does this happen?

First we must understand why the temperature changes, as earth rotates parts of it get closer to the sun like a globe the earth is tilted which makes part of the earth closer to the sun than other parts. Then later, it changes so the other part of the earth gets tilted towards the sun which makes that warmer. The equator no matter how the tilt will always be the closest to the sun.

Regular or uniform type

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