Astronomy

Astronomical Applications

• 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

Astrometry

• 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.  

• 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.

• Astrometry Information Center

  Your one-stop-source for astrometry related information.