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Astronomical Applications

Quartermaster Seaman with Sextant

Data Services

Sun and Moon rise and set times, Moon phases, eclipses, seasons, positions of solar system objects, and other data

Astronomical Information Center

Background information on common astronomical phenomena, calendars and time, and related topics

Almanacs and Other Publications

Astronomical and navigational almanacs, special publications, research reports

Software Products

Computer almanac for PCs and Macs, and more

For DoD Users

USNO Master Clock Time
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