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US Naval Observatory
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US Naval Observatory

US government observatory in Washington, DC, that provides the nation's time service and publishes almanacs for navigators, surveyors, and astronomers. It contains a 66-cm/26-in refracting telescope opened in 1873. A 1.55-m/61-in reflector for measuring positions of celestial objects was opened in 1964 at Flagstaff, Arizona.



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