This date marks the time of winds at night. This follows from the literary structure of the time of winds. There is 1 day of wind, which is a modern 30 day period, followed by a night of wind. It is that night time of wind that begins on this date. Those winds last for 15 modern calendar days.
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Theoretical Time:
Associated Scripture:
2 Exodus 10:13
13And Moses stretched forth his rod over the land of Egypt, and Jehovah brought an east wind upon the land all that day, and all the night; and when it was morning, the east wind brought the locusts.