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B
21st June
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C
23rd September
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D
22nd December
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Solution
The correct option is A 21st March On 21st March and 23rd September, direct rays of the sun fall on the equator. At this position, neither of the poles is tilted towards the sun; so, the whole earth experiences equal days and equal nights. This is known as Equinox. On 23rd September, it is the Autumnal Equinox in the Northern Hemisphere and spring season in the Southern Hemisphere. On 21st March, it is vernal Equinox in the Northern Hemisphere and autumn in the Southern Hemisphere.