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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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I wrote to Charles Worley who was in charge of the WDS catalogue at the United States Naval Observatory in Washington.
Using the Innes telescope again by Argyle, R.W. / Monthly Notes of the Astronomical Society of Southern Africa
To classify accident and traffic volume data by day and night, sunrise and sunset information was acquired from the United States Naval Observatory.
Comparison of the safety of lighting options on urban freeways by Griffith, Michael S. / Public Roads
NIST: National Institute of Standards and Technology NIST and the United States Naval Observatory, USNO, share time keeping responsibilities.
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