Some factors that go into this equation:

Universal Time is 20.45 in decimal hours.
The Julian date was 2459419.49917989.
The sun’s ecliptic longitude was 121.175710410672 degrees.
Its mean anomaly was 199.0318117532 degrees.
The moon’s mean longitude on 00 January 1990 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.)