Why are there equal lengths of day and night on March 20 or 21? On September 21 or 22.
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The two solstices happen in June (20 or 21) and December (21 or 22). ... The equinoxes happen in March (about March 21) and September (about September 23). These are the days when the Sun is exactly above the Equator, which makes day and night of equal length.
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because on these days, the sun is exactly above the equator and hence it makes the length of day and night equal..
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