The acceleration due to gravity near the surface of the Earth is 10 meters per second/per second. A nice round number. 10 meters. A meter is based on the length of the average human arm. All humans live near the surface of the Earth.
The sun and the moon appear to be the same size from near the surface of the Earth. The moon can appear to block out the sun because the moon is about 400 times closer to Earth than the sun, and sun is about 400 times larger than the moon.
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