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| Keywords: US Navy 030826-N-9593R-043 Personnel at the U.S. Naval Observatory in Washington, D.C., prepare the facility's historic 26-inch refractor telescope for optical viewing of Mars.jpg en Personnel at the U S Naval Observatory in Washington D C prepare the facility's historic 26-inch refractor telescope for optical viewing of Mars The telescope is the same one that discovered Phobos and Deimos the two moons of Mars in 1877 The telescope which still uses the original optics normally has a camera known as a speckle interferometer mounted in the viewing position for deep space studies The United States Naval Observatory USNO performs an essential scientific role for the U S Navy and Department of Defense DOD Its mission includes determining the positions and motions of the Earth Sun Moon planets stars and other celestial objects; providing astronomical reference data; measuring the Earth s rotation and orientation; determining precise time; and maintaining the Master Clock for the United States U S Navy photo by Chief Warrant Officer 4 Seth Rossman 2003-08-26 030826-N-9593R-043 Navy http //www navy mil/view_image asp id 9212 U S Navy photo by Chief Warrant Officer 4 Seth Rossman PD-USGov-Military-Navy United States Naval Observatory Refracting telescopes | ||||
