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2. The quarter from December to February has 31 + 31 + 28 (sometimes 29) = 90 (sometimes 91) days:

December 21 (solstice) 355 0 275
25 (*) 359 4 279
31 365 10 285
January 13 (Knot) 13 23 298
31 31 41 316
February 2 (Candle) 33 43 318
28 (29) 59 (60) 69 (70) 344 (345)

But counting from Christmas there are 7 + 31 + 28 (sometimes 29) = 66 (sometimes 67) days to the end of February.

Next we can coordinate right ascension with dates in our calendar:

0h 1h 2h 3h 4h 5h
80 95.2 110.4 125.7 140.9 156.1
March 21 April 5 April 20 May 6 May 21 June 5
6h 7h 8h 9h 10h 11h
171.3 186.5 201.7 217.0 232.2 247.4
June 20 July 6 July 21 August 5 August 20 Sept 4
12h 13h 14h 15h 16h 17h
262.6 277.8 293.1 308.3 323.5 338.7
Sept 20 Okt 5 Oct 20 Nov 4 Nov 20 Dec 5
18h 19h 20h 21h 22h 23h
353.9 369.2 384.4 399.6 414.8 430.0
Dec 20 Jan 4 Jan 19 Febr 4 Febr 19 March 6

A synodic lunar month is approximately 29.53 days long and day 354 = 12 * 29½ coincides with December 20 where the 19th hour is beginning.

"From excavated tally sticks, researchers have deduced that people counted days in relation to the Moon's phases as early as the Paleolithic age." (Wikipedia)

Our calendar has winter solstice as the day after 12 synodic lunar months, in December 21.