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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That's right - every new moon, beginning with the barley....