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The waning moon.

At 17:20:17 UT Monday 30 April 2018
the waning moon’s phase will be

99.50% full

Time Zone:   

Some factors that go into this equation:

Universal Time is 17.3547222222222 in decimal hours.
The Julian date will be 2458239.49495637.
The sun’s ecliptic longitude will be 40.332902495686 degrees.
Its mean anomaly will be 115.8408123688 degrees.
The moon’s true longitude will be 3468.47783164592 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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