What coincidence is due to the apparent similarity of the sizes of the Moon and the Sun from the Earth? Detailed answer

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What coincidence is due to the apparent similarity of the sizes of the Moon and the Sun from the Earth? Detailed answer

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What coincidence is due to the apparent similarity of the sizes of the Moon and the Sun from the Earth?

During a total solar eclipse, the lunar disk exactly coincides with the solar disk, covering it almost completely. This effect is due to an amazing coincidence: the diameter of the Sun is about 400 times the diameter of the Moon, but the distance from us to the Sun is also about 400 times greater, so from the Earth both luminaries seem approximately the same. This ratio of sizes and distances is unique for all the planets of the solar system and all their known satellites. Moreover, this coincidence happened precisely in our time, because the Moon is gradually moving away from the Earth, and after millions of years a total solar eclipse will no longer be visible.

Authors: Jimmy Wales, Larry Sanger

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