Precession

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What is precession?
the slow change in the direction of the pole of a spinning body
What causes precession?
the moon's gravitational pull trying to "straighten out" the direction of the Earth's spin
How long does it take?
26,000 years
What are some consequences of precession?
1) it changes which constellation the Sun is in on the equinoxes and solstices. 2) it can slowly alter the Earth's climate
How does precession affect astronomers star charts?
...
What does it do to the first point of Aries?
Due to Earth's axial precession, this point gradually moves westwards at a rate of about one degree every 72 years.
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