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II Equinox and Solstice

On about March 21 and September 23, both hemispheres are the same distance from the Sun and the Sun is said to be at an equinox. The Northern Hemispheres vernal equinox occurs in March and marks the beginning of spring. The Northern Hemispheres autumnal equinox occurs in September and marks the beginning of autumn. In the Southern Hemisphere, the vernal equinox occurs in September and the autumnal equinox occurs in March. At the equinoxes, the Sun appears to be directly over Earths equator. The lengths of day and night are then equal over almost all Earth, except at the poles. At the North Pole and South Pole, Earths atmosphere bends the Suns rays enough to make the Sun visible throughout the day and night, even during the 12 hours the Sun is below the horizon.

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