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The term solstice is used to describe the exact moment when the sun reaches its northernmost point (around June 21) or southernmost point (around Dec. 22) from the earth's equator. But even though winter solstice occurred this year on Dec. 21, we passed a second milestone on Jan. 4, when we celebrated perihelion. Perihelion is the day when the earth is actually closest to the sun. If that's the case, why isn't it a lot warmer this time of year? The reason is because Earth's elliptical orbit has nothing to do with seasons. It has to do with the tilt of the earth's axis. [Source: Sandusky Register]
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