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The waning moon.

At 18:08:35 UT Monday 30 April 2018
the waning moon’s phase was

99.45% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 18.1597222222222 in decimal hours.
The Julian date was 2458239.49445733.
The sun’s ecliptic longitude was 40.365480793537 degrees.
Its mean anomaly was 115.8738726239 degrees.
The moon’s mean longitude 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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