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.
Remote sensing reference providing information on satellites and sensors, distribution of data, and products and applications.