• NOAA Solar Calculator - Find Sunrise, Sunset, Solar Noon and Solar Position for any location.
• NOTE: The USNO websites aa.usno.navy.mil, ad.usno.navy.mil, aristarchus.usno.navy.mil, maia.usno.navy.mil, rorf.usno.navy.mil, and toshi.usno.navy.mil are undergoing modernization efforts. The expected completion of the work and return of service is estimated as 30 April 2020.
  USNO - Sunrise/Sunset & Moonrise/Moonset Calculator for one day, anywhere in the U.S.
• USNO - Sunrise/Sunset & Moonrise/Moonset Tables for one year, anywhere in the U.S.
• USNO - Phases of the Moon
• Perigee and Apogee Calculator

• National Ocean Service (NOS) Tide Predictor
• World Wide Tide Predictor

• Official U.S. Time

The U.S. Naval Observatory (USNO) computes astronomical data. Therefore, the NWS does not record, certify, or authenticate astronomical data. Computed times of sunrise, sunset, moonrise, moonset; and twilight, moon phases and other astronomical data are available from USNO's Astronomical Applications Department (http://www.usno.navy.mil).

The USNO websites aa.usno.navy.mil, ad.usno.navy.mil, aristarchus.usno.navy.mil, maia.usno.navy.mil, rorf.usno.navy.mil, and toshi.usno.navy.mil are undergoing modernization efforts. The expected completion of the work and return of service is estimated as 30 April 2020.
See U.S. Naval Observatory - FAQ - Litigation for information on using these data for legal purposes.