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By in
on Jul 13, 2012

The wobbling Earth.

Tidal forces from the sun cause the earths axis to wobble over a 26,000 year period. The wobble changes where in Earths orbit the solstices and equinoxes occur. Credit: NASA, Mysid (Wikipedia)

Tidal forces from the sun cause the earths axis to wobble over a 26,000 year period.  The wobble changes where in Earths orbit the solstices and equinoxes occur.  Credit: NASA, Mysid (Wikipedia)

The wobbling Earth.