Winter Holy Day and New Month

Jubilees 6:28 And on the new moon (month) of the tenth month the tops of the mountains were seen, and Noah was glad. And on this account he ordained them for himself as feasts for a memorial for ever, and thus are they ordained. And they placed them on the heavenly tablets, each had thirteen weeks; from one to another (passed) their memorial, from the first to the second, and from the second to the third, and from the 30 third to the fourth. And all the days of the commandment will be two and fifty weeks of days, and (these will make) the entire year complete.