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Bible Months

The original Biblical calendar was lunar-based, with each month beginning at the determined time of the new moon. In ancient times, this was done by direct observation, the first day of the month declared when the first sliver became visible after the dark of the moon.

Bible Month Length Roman Calendar Equivalent
1. Nisan 30 days March-April
2. Iyar 29 days April-May
3. Sivan 30 days May-June
4. Tammuz 29 days June-July
5. Av 30 days July-August
6. Elul 29 days August-September
7. Tishri 30 days September-October
8. Cheshvan 29 or 30 days October-November
9. Kislev 30 or 29 days November-December
10. Tevet 29 days December-January
11. Shevat 30 days January-February
12. Adar 29 or 30 days February-March
13. Adar II 29 days March-April

In the fourth century, a fixed calendar was developed by Jewish scholars to compensate for the fact that there are 12.4 lunar months in a solar year. The new version, used right to modern times, standardized the calendar for the course of a 19 year cycle, so that it meshes perfectly with the seasons. To do this, certain months had a set variable number of days, and a 13th month, Adar II, was added in the 3rd, 6th, 8th, 11th, 14th, 17th and 19th years of the cycle. Although its rules can seem complicated, it is actually a very simple system of having a perfectly natural calendar.

Fact Finder: At the time of Creation, what did God say about how to mark days, months, and seasons?
Genesis 1:14-19

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