Astronomy
The Sky This Week
a weekly set of pictures and descriptions of the sky, stars, and planets.
Astronomical Applications
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Data Services
Sun and Moon rise and set times, Moon phases, eclipses, seasons, positions of solar system objects, and other data
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Astronomical Information Center
Background information on common astronomical phenomena, calendars and time, and related topics
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Almanacs and Other Publications
Astronomical and navigational almanacs, special publications, research reports
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Software Products
Computer almanac for PCs and Macs, and more
Astrometry
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Optical/IR Products
Optical/infrared image and catalog products provided by the USNO. Astrometric catalogs include NOMAD, UCAC, USNO-B1, etc. Imaging products include digital scans of a number of the major Schmidt telescope surveys of the skies, along with the catalogs of astronomical objects created from those images.
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VLBI-based Products
Very Long Baseline Interferometry (VLBI) is a technique used by radio astronomers and geodesists to determine the celestial and terrestrial reference frames and to predict the variable orientation of the Earth in three-dimensional space.
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Astrometry Information Center
Your one-stop-source for astrometry related information.