Harvard-Smithsonian Center for
Astrophysics


Project ATLAS Homepage

Natural and Artificial Satellites





Natural and Artificial Satellites

Artificial Satellites: A satellite is a celestial body that orbits a planet. A satellite orbits a planet because is to the force of gravity. Unlike natural satellites, like the Moon, artificial satellites are made by human beings.

The Global Positioning System (GPS): The following links are a good starting place to acquire a wealth of technical and practical details of GPS. They contain numerous links to other sites of GPS interest.
Space Geodesy Group
Harvard-Smithsonian Center for Astrophysics
60 Garden St, MS 42
Cambridge, MA 02138-1516