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| 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
