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Q. The equal length of day and night on September 23rd in all parts of the world is known as
Answer: Autumnal Equinox
Notes: Equinox means two days during the year, March 21 and September 23, when day and night are almost equal throughout the world because the Sun shines vertically on the Equator. March 21 is called vernal equinox and September 23 is called autumnal equinox.

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