Why are days and nights equal on 21st March at all places on the earth ? Explain
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On 21st March and September 23rd, 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 called an equinox.
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On 21st March 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.
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