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Obliquity of the Nine Planets

Target Name:  Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto
Spacecraft:  Voyager, Viking, Mariner 10,
Produced by:  Calvin J. Hamilton
Copyright: © 1999 Calvin J. Hamilton
Date Released: 27 February 1999
(Publisher Permission Request)

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This illustration shows the obliquity of the nine 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, Uranus, and Pluto have a retrograde rotation, or a rotation that is in the opposite direction from the other planets. The following table lists the obliquity and rotation period of each of the planets.

ObliquityRotation Period (hrs)
Mercury0.1°1407.5
Venus177.4°5832.5
Earth23.45°23.9345
Mars25.19°24.623
Jupiter3.12°9.925
Saturn26.73°10.656
Uranus97.86°17.24
Neptune29.56°16.11
Pluto119.6°153.29

This image is © copyright 1999 by Calvin J. Hamilton.

Copyright © 1995-2013 by Calvin J. Hamilton. All rights reserved.