- Glossary of Satellite Terms
Provides information on visible satellite passes and real-time orbit displays for any location in the world.
Offers wholesale satellite communications services.
- Lloyd's Satellite Constellations
Index and commentary on Iridium, Teledesic, Globalstar, ICO, Orbcomm, GPS and other LEO/MEO/GEO schemes.
- NASA: How Satellites Work
Teacher's resource, covering satellite design, orbits, launching, and more.
- National Reconnaissance Office@
- Satellite Encyclopedia, The
Fact sheets containing basic information such as launch date, country of origin, official identification, and payload description.
Tells when certain selected spacecraft will be in range for visual observations or for radio communications. Data are provided in tabular form for cities in the United States and Canada.
- Small Satellites
Resources for, and links to small satellite projects.
- TELSAT Guide
Remote sensing reference providing information on satellites and sensors, distribution of data, and products and applications.
- UCS Satellite Database
Lists operational military and civilian satellites currently in orbit around the Earth. From the Union of Concerned Scientists.
- United States Space Command (USSPACECOM)@
- Visual Satellite Observer
Provides information on why, when, and what to look for in terms of satellites in the night sky.