The Orrery
The Orrery is an interactive Solar System simulator. Choose a time, a place, and what you want to look at, and generate your own stunning pictures. You can make

• Snapshots of the planets from anywhere in the solar system
• Animations of celestial phenomena like eclipses and occulations
• Night Sky pictures showing what planets you can expect to see, anytime, anywhere in the world.

Facts and figures
A family picture of the Solar System, with information about its members.

Planet Locator
Look up the positions of the planets in the sky, or get an image of where they are in your sky.

Articles
Explanations of astronomical phenomena:

• Seasons Understanding how and why there are seasons on Earth.
  
• Eclipses What is an eclipse? When do the happen? Why are they so rare?
  
• Phases Why does the Moon change its appearance? What is the complete cycle? Do planets also display phases?
  
• Retrograde motion of planets What is "retrograde motion"? Do planets really stop and reverse directions?