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Why do eclipses happen?

9 Jun 2021, 19:30 UTC
Why do eclipses happen? ESO/P. Horálek/Solar Wind Sherpas project

Solar eclipses are relatively rare; they happen when the Moon moves directly and precisely in front of the Sun. Why are they so infrequent, and why do solar eclipses always come in pairs with lunar eclipses?

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