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At 20:40:24 UT Monday 30 April 2018
the waning moon’s phase was
is 20.69 in decimal hours.
The Julian date was 2458239.49273923.
The sun’s ecliptic longitude was 40.467877236145 degrees.
Its mean anomaly was 115.9777876906 degrees.
The moon’s true longitude was 3470.24404580244 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.)