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The new moon.

At 12:27:13 UT Thursday 15 February 2018
the moon’s phase was

NEW

Time Zone:   

Some factors that go into this equation:

Universal Time is 12.4702777777778 in decimal hours.
The Julian date was 2458164.50125155.
The sun’s ecliptic longitude was 326.769579450801 degrees.
Its mean anomaly was 42.7023105064 degrees.
The moon’s true longitude was 2482.7147593841 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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