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 22:07:53 UT Saturday 17 February 2018
the waxing moon’s phase is

4.16% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 22.1480555555556 in decimal hours.
The Julian date is 2458166.54155442.
The sun’s ecliptic longitude is 329.195387654774 degrees.
Its mean anomaly is 45.0710583893 degrees.
The moon’s true longitude is 2512.71961325133 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

© 1997–2018 by 3IP.