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Resources:
The United States Naval Observatory
The USNO mission is to determine the positions and motions of celestial objects, to provide astronomical data, to measure the Earth's rotation and to maintain the Master Clock for the United States.
http://www.usno.navy.mil/
NASA Earth Observatory
Explore the causes and effects of climatic and environmental change through the use of real satellite data.
http://earthobservatory.nasa.gov/
European Southern Observatory
An intergovernmental, European organisation for astronomical research, operates astronomical observatories in Chile and has its headquarters in Garching, Germany.
http://www.eso.org/
Griffith Observatory
Observatory is closed to the public until 2005 for major renovations. There are historical facts and photographs available, and information about exhibits and telescopes used before the closure. Renovation information and updates are also provided.
http://www.griffithobs.org/
U.S. Naval Observatory
America's official timekeeper, providing accurate spoken time based on the USNO Atomic Clock, GPS, Loran and Omega time information, U.S. time zone conversions, and other pertinent timekeeping information.
http://tycho.usno.navy.mil/
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