To look up the phase of the moon for any date,
just fill out the form below, then hit "Find Phase."

The waxing moon.

At 13:43:29 UT Friday 28 April 2017
the waxing moon’s phase is

6.34% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 13.7413888888889 in decimal hours.
The Julian date is 2457871.56337104.
The sun’s ecliptic longitude is 38.478399128417 degrees.
Its mean anomaly is 113.95983788959 degrees.
The moon’s true longitude is 67.6389314016522 degrees.

These calculations incorporate the switch to the English New Style (N.S.)—i.e., Gregorian— calendar after Wednesday, 02 September 1752; the next day became Thursday, 14 September, skipping eleven days. (Please also note that, while fairly accurate, these calculations remain a bit buggy.)

 Send comments to

© 1997–2017 by 3IP.