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An equinox happens twice a year, when the tilt of the Earth's axis is inclined neither towards or away from the Sun, the centre of the Sun being in the same plane as the Earth's equator.

The term "equinox" is derived from the Latin "aequus" (equal) and "nox" (night). Because around the equinox, day and night have an approximately-equal length.

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13y ago

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