SkyServer's About Astronomy and About SDSS pages contain background material to help students and teachers understand the concepts in this project. In addition to SkyServer pages, the references below give more information about the topics covered in this project, and give information and perspectives that may be of interest.

Longitude & Latitude

• David Stern: Stargaze: Longitude & Latitude [Online Textbook]
• Nebraska Astronomy Applet: Terrestrial Coordinates [Animation]

Celestial Coordinates (RA/Dec)

• SkyServer: Mapping the Sky [Web Text]
• The Celestial Sphere Page [Web Text]
• Sky & Telescope: Understanding Celestial Coordinates [Web Text]
• David Stern: Stargaze: The Celestial Sphere [Online Textbook]
• Nebraska Astronomy Applet Project: Celestial Coordinates [Animation]

The Ecliptic

• David Stern: Stargaze: The Ecliptic
• VSU Astronomy Animations: Celestial Equator and the Ecliptic [Animation]

Asteroids

• World Book at NASA: Asteroids [Web Text]
• Nick Strobel: Astronomy Notes: Asteroids [Web Text]

The Seasons

• Nebraska Astronomy Applet Project: Season and Ecliptic Simulator [Animation]
• VSU Astronomy Animations: Seasons [Animation]
• DATA Animation: Seasons [Animation]
• David Stern: Stargaze: Seasons [Online Textbook]