The Hebrew Calendar

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Months of the Hebrew Year
Normal Year
Month Name
Days
1. Abib or Nisan **30
2. Iyar 29
3. Sivan ** 30
4. Tammuz 29
5. Ab 30
6. Elul 29
7. Tishri ** 30
8. Heshvan 29 or 30
9. Kislev29 or 30
10. Tebeth29
11. Shebat 30
12. Adar29
Leap (Intercalary) Year *
Month Name
Days
1. Abib or Nisan **30
2. Iyar 29
3. Sivan ** 30
4. Tammuz 29
5. Ab 30
6. Elul 29
7. Tishri ** 30
8. Heshvan 29 or 30
9. Kislev29 or 30
10. Tebeth29
11. Shebat 30
12. Adar I 30
13. Adar II29
 

* In a leap or intercalary year an additional 30-day month is added.

** Denotes month containing at least one of God's Annual Holy Days of worship

Tishri 1 (Feast of Trumpets) is the first day of Hebrew year.
 
 
 
 
What are God's annual Holy Days of worship?
 
 
Are believers required to observe the
NEW MOONS?
 
 
Why was the New Testament written in Greek? 
 
 
Map of the world as known to the ancient Hebrews
Hebrew Calendar Definitions

Common year

A 12-month year in the Hebrew Calendar. A deficient common year contains 353 days, a regular common year contains 354 days, and a perfect common year contains 355 days.

Hour

A measurement of time in the Hebrew Calendar equating to 1080 parts or 3600 seconds. The use of hours has the advantage of eliminating fractions. Hours are calculated from 6 PM; thus 6 hours equates to 12 Midnight, 12 hours equates to 6 AM, and 18 hours equates to 12 Noon.

Intercalary year

A 13-month year in the Hebrew Calendar. A 30-day month called Adar I is added in years 3, 6, 8, 11, 14, 17, and 19 of each 19-year cycle. The result is a year with 383, 384 or 385 days. Also referred to as a leap year.

Molad

The calculation of the average conjunction of the moon with the earth and the sun; it is based on the mean or average length of the lunar month, which is 29.53059 days. The Molad is not the astronomical conjunction.

Part

A measurement of time in the Hebrew Calendar equating to 3 1/3 seconds. There are 18 parts to a minute and 1080 parts to an hour.

Postponement

A one or two-day adjustment to the calculation of the Molad of Tishri. These adjustments enable the process of calculating the Molad to consistently achieve the greatest degree of accuracy in relationship to the cycle of the moon.


Calendar Rules used to
determine dates for God's Feast Days

Postponements are part of the process of calculating and declaring the date of the Feast of Trumpets (Tishri 1, the first day of the Hebrew sacred year), which in turn is used to set the year's dates for observing God's annual Holy Days. After calculating the Molad of Tishri, the following postponement rules are used to declare Tishri 1.

  • Rule One
    When Tishri's Molad or advancement occurs on a Sunday, Wednesday, or Friday, the declaration of Tishri 1 is advanced one day to a Monday, Thursday or Saturday (Sabbath) respectively. This rule prevents the Day of Atonement (Yom Kippur) from falling on a Friday or Sunday. Since Atonement is a complete day of fasting coupled with the command that absolutely NO work is to be done on the day, this rule prevents a fast day followed by a day of feast and rejoicing before God (the Saturday Sabbath) and vice versa.

  • Rule Two
    When Tishri's Molad happens at or after noon (18 hours 0 parts), the declaration of Tishri 1 is delayed to the following day.

  • Rule Three
    When Tishri's Molad of a common year occurs on a Tuesday (on or after 9 hours and 204 parts) the declaration of Tishri 1 is moved to the next day (Wednesday). Then, because of the above listed Rule One, the day declared as Tishri 1 is moved to Thursday.

  • Rule Four
    When Tishri's Molad of a common year comes right after an intercalary year occurs on a Monday, at or after 15 hours and 589 parts, the declaration of Tishri 1 is advanced to Tuesday. This rule applies roughly once every 186 years.

Additional Study Materials
What do each of God's
Holy Days MEAN?
Can God be worshipped
in different ways?
 
How did Jesus and the disciples
determine when to keep the Holy Days?
 
 
 
 
   
 
 
 
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