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At 11:38:04 UT Thursday 21 September 2017
the waxing moon’s phase is
is 11.6511111111111 in decimal hours.
The Julian date is 2458017.51823751.
The sun’s ecliptic longitude is 178.67516465682 degrees.
Its mean anomaly is 257.77850705683 degrees.
The moon’s true longitude is 554.197757211473 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.)