Things got moved around a bit.
The extrabiblical evidence from the first and second century is equally spare: There is no mention of birth celebrations in the writings of early Christian writers such as Irenaeus (c. 130200) or Tertullian (c. 160225). Origen of Alexandria (c. 165264) goes so far as to mock Roman celebrations of birth anniversaries, dismissing them as pagan practicesa strong indication that Jesus birth was not marked with similar festivities at that place and time.1 As far as we can tell, Christmas was not celebrated at all at this point.
Good reading here:http://www.biblicalarchaeology.org/daily/biblical-topics/new-testament/how-december-25-became-christmas/
Yehova’s days fall only on the Biblical calendar, which revolves around the beginning of the agricultural year, the new moon immediately preceding the aviv barley in Jerusalem.
Passover is completely dependent on this event, and all other events flow from Passover.
The seventh, eighth, ninth, and tenth biblical months usually fall close to September, October, November, and December, but the relationship is never exact because God’s calendar is agricultural, while man’s follows sun god worship,the solstices and the equinoxes.
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YHWH's calendar, of course.