The equinoxes, about March 21 and September 21, mark the two days a year when the sun appears over the equator. Check this site for a lot more information.
http://en.wikipedia.org/wiki/Autumnal_Equinox_Day
Even in the summer in the Arctic, the tilt of the earth is such that the sun only appears above the Tropic of Cancer -- a long way from the Arctic.
why are the lengths of days in spring and autumn the same?
if the sun does not set, why is it so cold?
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