ESO is the European Organisation for Astronomical Research in the Southern Hemisphere. It operates the La Silla Paranal Observatory in Chile and has its headquarters in Garching, near Munich, Germany.
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.
Slooh is an online observatory and resource for astronomy enthusiasts to remotely stargaze the night sky and explore space such as planet Mars and Saturn rings with a powerful telescope for hobbyists