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      an imaginary straight line around which an object spins


Earth spins on its axis once every 24 hours.

Earth’s axis goes from the North Pole through Earth’s center to the South Pole and is tilted.

Related Links:
What's a Solstice?
What Causes the Seasons?


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Earth during a winter solstice
Seasons are caused by the tilt of Earth’s axis.
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Page Last Updated: October 3rd, 2014
Page Editor: Sandra May