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The new moon.

At 01:01:33 UT Saturday 10 July 2021
the moon was

NEW


Some factors that go into this equation:

Universal Time is 1.0425 in decimal hours.
The Julian date was 2459405.5001.
The sun’s ecliptic longitude was 108.008834423965 degrees.
Its mean anomaly was 185.4213564924 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.)

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