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