• Seeking info about use of astronomical data in litigation? See our litigation information page.
• Questions regarding the Moon phase image hosted by USNO Time Service Department at http://tycho.usno.navy.mil/cgi-bin/phase.gif? Please see the USNO Master Clock page for contact information.
• Technical questions about the data we provide? Check our Astronomical Information Center page.
• Not familiar with our web site? Start at our Home Page.
• Can't find something?
  • Try our Site Map
  • Search our Astronomical Information Center pages:
• Questions on basic astronomy or on astronomical subjects unrelated to our web site? Try:
  • Ask an Astronomer (Cornell University)
  • Ask an Astronomer (Lick Observatory)
  • Ask an Astrophysicist (Goddard Space Flight Center)
  • Ask the Space Scientist (Goddard Space Flight Center)

  Note that we do NOT answer questions or provide further information on the following subjects:

  • time zone conversion
  • weather
  • maps and charts
  • city locations (lat. & long.)
  • tides
  • hunting/fishing

• Interested in methods for computing times of rise/set? See our FAQ page on Computing Times of Rise and Set.
• Having trouble printing pages? For instructions on printing the One Year Rise/Set Table, see the Notes section on that page.
• Want to import one of our data tables into a spreadsheet? See the Notes sections of the One Year Rise/Set Table or the Duration of Daylight/Darkness Table.

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