Why are days and nights are equal at all places on earth on September 23? What are the seasons in the northern and southern hemisphere on this date?
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Days and nights are equal at all places on earth on September 23 because on this date, the sun shines vertically over the equator, making day and night of equal length.
It is autumn season in the northern hemisphere and spring season in the southern hemisphere.
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Explanation:
It is event known as equinox.
During 23 September the sun moves across the celestial equator which lies directly above the earth's equator.
On 21st March and 23rd September the days and flights are equal all over and world due to the sun's rays vertical on the equator.
The season may be spring or autumn.
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