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The days when the Sun shines vertically on the equator is called?

The days when the Sun shines vertically on the equator is called?
Equinox occurs when the sun is vertically above the equator. At this time, the sun equally illuminates the Southern and Northern hemisphere. At this time the world experiences equal day and night. Equinox occur twice a year.

On September 23, the Sun’s rays fall vertically on the Equator. As a result, on this day the Sun illuminates the Northern and Southern Hemispheres equally, making the days and nights of approximately equal length all over the Earth. Since the days and the nights are of equal length, the season is neither too hot nor too cold. After this date the position of the Earth, revolving round the Sun, is such that the Northern Hemisphere starts tilting away from the Sun and the Southern Hemisphere tilts gradually towards the Sun. So in the Northern Hemisphere the days start getting shorter and the nights longer. This position is called the ‘Autumnal Equinox’. Conversely, it is spring in the Southern Hemisphere.

Similarly, on March 21, the Sun’s rays again fall vertically on the Equator, making the days and nights of approximately equal length all over the Earth again, like the 23rd of September. This time, it is autumn in the south and spring in the north. This position is called the ‘Spring Equinox’. After this date the Northern Hemisphere starts leaning towards the Sun, so the days will start getting longer and the nights shorter.