To look up the phase of the moon for any (Common Era) date,
just fill out the form below, then hit “Find Phase.”
At 23:42:10 UT Sunday 09 May 2021
the moon’s phase is
is 23.7194444444444 in decimal hours.
The Julian date is 2459343.529473.
The sun’s ecliptic longitude is 49.575104032047 degrees.
Its mean anomaly is 125.2425316607 degrees.
The moon’s mean longitude on 00 January 1990 was 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.)