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The waxing moon.

At 11:53:14 UT Wednesday 19 December 2018
the waxing moon’s phase is

86.54% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 11.9038888888889 in decimal hours.
The Julian date is 2458472.36537656.
The sun’s ecliptic longitude is 267.554341231044 degrees.
Its mean anomaly is 345.2727880959 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.)

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