Noah's Curious Calendar

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The Flood began on the seventeenth day of the second month of Noah's life, and it rained for forty days. Then the rain stopped so the water could begin draining off and leave the ark aground. A period of exactly five months went by. Those five months are recorded as exactly 150 days. If we were to try and use the months of the Jewish calendar, the number of days would not add up to 150. Here's why.

The months of the Jewish calendar supposedly equivalent to the months of the Flood are:

lyar . . . . . . . . 29 days
Sivan . . . . . . . 30 days
Tammuz . . . . . 29 days
Av . . . . . . . . . 30 days
Elul . . . . . . . . 29 days
Tishri . . . . . . . 30 days

Using the Jewish calendar, it would begin raining on the 17th of lyar, thus flooding a total of 13 days during that month. Following would be 30 in Sivan, 29 in Tammuz, 30 in Av, 29 in Elul, and lastly 16 in Tishri if we don't count the day that the ark ran aground. The total number of days from the beginning of the Flood until the day the ark went aground, would have been, according to the Jewish calendar, 147; which is three days short of 150.

However, we can safely ignore the Jewish calendar, and just reckon the elapsed time relative to Noah's birthday. The 150 days then average out to five months of 30 days apiece. That doesn't really cause any problems because a dating method of that nature is not intended to mark off the actual passage of astronomical time in a calendar year; only the days of time elapsed during an important event such as the Flood.

So; here in Genesis, very early in the Bible, a precedent is set for specifying the length of a special kind of year: the prophetic year. Since the months in a year of this type are of thirty days apiece, then twelve such months add up to 360 days; which is 5¼ days less than a calendar year.

The prophetic year is sort of like a baker's dozen. Though a baker's dozen is not a dozen of twelve; it is nonetheless a dozen in its own right. As long as students of the Bible are aware of the existence of such a thing as a prophetic year, they won't be tripped up when they run across it in prophecy; for example the one below:

"And the woman fled into the wilderness, where she hath a place prepared of God, that they should feed her there a thousand two hundred and threescore days." (Rev 12:6)

"And to the woman were given two wings of a great eagle, that she might fly into the wilderness, into her place, where she is nourished for a time, and times, and half a time, from the face of the serpent." (Rev 12:14)

Those two passages speak of a 3½ year period of exactly 1,260 days. Well, 3½ solar years is 1,274+ days; which is almost fifteen days too many. But if we reckon those 3½ years as prophetic years of 360 days each, then it comes out perfectly to 1,260 days.
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