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When the sun is directly over the equator, the Northern Hemisphere has either the Spring Equinox (approximately March 22nd) or the Fall (Autumn) Equinox (approximately September 22nd.) During these events, the length of night and day are both 12 hours long around the world. For the Southern Hemisphere, these are reversed, with the March equinox occurring in the autumn.

*At the poles, the equinoxes mark the beginning and the end of the six-month periods of daylight and of night. From March to September it is always day at the North Pole, and from September to March, it is night.

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