Table of essential measurements and facts regarding the nine planets with links to highly detailed summaries.
http://nssdc.gsfc.nasa.gov/planetary/factsheet/index.html
The rotation period of a large body circled by one or more satellites can be calculated theoretically.
http://www.geocities.com/saeles/planetsrotation.htm
Information about planetary astronomy and space exploration and habitat. Online chat, message boards, and related links. Sells replicas and toys.
http://www.skyscopes.com/
Explore the solar system's planets. Includes pictures, descriptions, statistical information and a special section on the latest voyage to Mars.
http://www.d.smiley1.btinternet.co.uk/
A theory about the rotation of sun and planets, planetary rings, origin of solar system, solar cycles and climate variations.
http://www.heeke.com/franz
Provides detailed information related to known bodies in orbit around the Sun. Ephemerides, physical parameters, Earth close-approaches, observer tools.
http://ssd.jpl.nasa.gov/
The Solar System Exploration Home Page is part of NASA's Office of Space Science and describes NASA's program to explore the solar system.
http://solarsystem.nasa.gov/index.cfm
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