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

The waning moon.

At 12:59:22 UT Friday 26 April 2019
the waning moon’s phase is

53.79% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 13.0061111111111 in decimal hours.
The Julian date is 2458600.03792331.
The sun’s ecliptic longitude is 36.031478749692 degrees.
Its mean anomaly is 111.4809164808 degrees.
The moon’s mean longitude is 318.351648 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

© 1997–2019 by 3IP.