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When is the earth's moon and the sun in the same position?

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Every 18 years 11 1/3 days the earth moon and sun are in very nearly the same relative positions; for this reason solar and lunar eclipses recur in a cycle with this period. This cycle was known to the Chaldaeans (fl. 1000-540 BC) and was called the saros by them. Halley's comet reappears in a cycle whose period is about 75 years.

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