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Q. When does the entire earth experience equal days and nights?
Answer: Day of equinox
Notes: Equinox literally means "equal night", giving the impression that the night and day on the equinox are exactly the same length; 12 hours each. There are two equinoxes every year, in March and September. When the Sun shines directly on the equator, and the length of night and day are nearly equal.

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