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stellar-indulgence:

This illustration shows the obliquity of the eight planets. Obliquity is the angle between a planet’s equatorial plane and its orbital plane. By International Astronomical Union (IAU) convention, a planet’s north pole lies above the ecliptic plane. By this convention, Venus and Uranus have a retrograde rotation, or a rotation that is in the opposite direction from the other planets. 

Sometimes the blog needs some actual science stuff. :p

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