Introduction:

This circular provides the times of the phases of the Moon, expressed in Terrestrial Dynamical Time (TDT), for the years 2000–2049. The basis for this circular is the Jet Propulsion Laboratory (JPL) ephemeris designated DE200/LE200, which was also used for The Astronomical Almanac when the circular was published.

Note: USNO web services supersede this circular. Please visit the Phases of the Moon web page for the current dates and times. The Astronomical Almanac now uses JPL ephemeris DE405/LE405.

Obtaining a Copy:

Download a Free Copy. USNO Circular 169 is available free of charge as a PDF document. Click on the link below to download the publication.

• USNO Circular 169 PDF (2.7M)

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