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Episode 76: What Causes Seasons?

Play Jan 4•4:19

On Jan. 4, 2006, the Earth reached perihelion, or the closest point in its elliptical orbit to the Sun. Yet the Northern Hemisphere isn't exactly toasty in the beginning of January. What gives? It's actually the tilt of the Earth that causes the changes in the seasons, not the proximity of the Earth to the Sun. Right now the Northern Hemisphere is tilted away from the Sun, meaning less sunlig...

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