Phases of the Moon
Astronomical Applications Dept. Astronomical Applications Dept.
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Enter a year between 1700 and 2035 in the form below and press the "Get Data" button to obtain a calendar showing the dates of the primary phases of the Moon for that year.




For definitions of the phases, see the explanation of Phases of the Moon and Percent of the Moon Illuminated in the Astronomical Information Center. In addition, the explanation of Crescent Moon Visibility discusses the waxing crescent phase.

Time Format

In the output table, d, h, m indicate day, hour, minute, respectively, of Universal Time. To convert the times given to local time, see the U.S. Time Zones explanation or the World Time Zone Map in the Astronomical Information Center.

Computing the Phase for a Particular Day

Several of our Data Services will compute the fraction of the Moon illuminated for particular days. The Fraction of the Moon Illuminated service provides values for each day of a calendar year. The Complete Sun and Moon Data for One Day reports the percent illuminated for a particular day along with location-specific data. What the Moon Looks Like Now is a simulated image of the Moon at the current time; a similar image for a specific date can be generated using the Apparent Disk of Solar System Object service.