How does the Biblical calendar WORK?
What are NEW MOONS?

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Hebrew (Biblical) days begin at sunset, with the weekly Sabbath occuring from Friday sunset to Sunday sunset. Our present system of time divides a day into 24 hours, with each hour composed of 60 minutes, and each minute further divided into 60 seconds. The Hebrew day also has 24 hours, but each hour is divided into 1,080 parts (3,600 of our modern seconds). This means that a Hebrew 'part' is roughly equivelant to 3 1/3 seconds.

Hebrew civil years, which begin in the Spring, consist (usually) of twelve months. These months are Abib (Nisan) with 30 days, Iyar (29 days), Sivan (30 days), Tammuz (29 days), Ab (30 days), Elul (29 days), Tishri (30 days), Heshvan (29 or 30 days), Kislev 29 or 30 (29 or 30 days), Tebeth (29 days), Shebat (30 days) and Adar (29 days).

There are several types of years in the Hebrew (Biblical) calendar. A deficient common year contains 353 days, a regular common year contains 354 days and a perfect common year contains 355 days. An intercalary or leap year is one where a thirteenth month, called Adar 1, is added. Leap years can be composed of 383, 384 or 385 days.

Why New Moons were important in Biblical times

Some ancient Israelites observed something called New Moons. When a New Moon occurred (roughly every 29 days) the people used the day not only to mark time but also to rejoice before God. King Saul, the first human king over a united Israel, held special meals or banquets on these days (1Samuel 20). New moons featured prominently in the Old Testament and even in the New Testament.

In today's world we are not likely to lose our calendars. With computers, the Internet, cable and broadcast television, radio, newspapers, watches, cell phones, iPads and so on we can know (whenever we wish) the year, month, date and time with incredible accuracy. In biblical times, however, this was not so. Faithful observance of each new moon was required so that the calendar would never become corrupted. To people in the Bible new moons were their calendars.

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
Timeline of the
Old Testament
When Greeks and other nationalities came into the church during Roman times, how would they have known WHEN to observe the Holy Days? They couldn't buy a calendar. Without observing (taking note of) the new moons they would have NO IDEA when to observe the Feast days.

The fact that the apostle Paul mentions these days in Colossians 2:16 does not mean they were commanded for the entire church or even the Colossians themselves. They needed to keep a diligent track of the new moons since no one else in their society was going to do that for them. To keep track of the new moons in Biblical times was a way of accurately knowing the passage of time. It was absolutely essential for keeping track of dates IF one wanted to know when the seventh new moon of the year (i.e. the Day of Trumpets), as well as all the other Holy Days, would occur.

New Moons in the Real World

The difficulty arising with observing these days comes from the fact that the moon appears differently to different parts of the world. Would we observe these days when the new moon occurs over Jerusalem? Or would we observe the days of the actual invisible new moon conjunctions as our "new mondays"? Or would our observance be based on when this celestial event occurred in OUR part of the earth? For example, the weekly Sabbath is observed based on the time at which the LOCAL sunset occurs. So would we observe new moons "as they come to us," with the result that people in different parts of the world would observe them on different days of the Roman calendar?

The Day of Trumpets is a new moon day. So IF we were to observe new moons based on when they occur in our locality, then we would end up keeping the Day of Trumpets (and therefore also the Feast of Tabernacles) on different days from other people in different areas of the world.

In conclusion, we do not have to observe the new moons today for the below reasons.

  1. There is NO commands anywhere in the Bible to observe new moons in a religious manner.

  2. There are NO instructions or guidelines on how the Biblical new moons should be observed

  3. Leviticus chapter 23 carefully lists ALL the days in the year God expects us to observe in a religious manner. New moons simply are not listed!

  4. Inferences from references to new moons during the millennial reign of Jesus Christ on earth are not clear indications for what we today should be doing.

Observing these days in biblical times is very understandable. It was the only way people could keep an accurate track of the passage of time. Carefully taking note of the phrases of the moon was the equivalent of people having a watch which also displays the date and the day of the week. If people during the rule of Christ observe new moons the conditions will no doubt be different as every month will be perfect - meaning no adjustments needed.

Dates for
God's Annual Feast Days
Feast of
Unleavened Bread
Feast of
Feast of
Day of
Feast of
The Last
Great Day
April 14
April 15 - 21
Tuesday - Monday
June 8
Sept. 25
Oct. 4
Oct. 9 - 15
Thur - Wed
October 16
April 3
April 4 - 10
Saturday - Friday
May 24
Sept. 14
Sept. 23
Sept. 28 - Oct 4
Mon - Sun
October 5
April 22
April 23 - 29
Saturday - Friday
June 12
Oct. 3
Oct. 12
Oct. 17 - 23
Mon - Sun
October 24
April 10
April 11 - 17
Tuesday - Monday
June 4
Sept 21
Sept 30
Oct. 5 - 11
Thur - Wed
October 12
March 30
March 31 - April 6
Saturday - Friday
May 20
Sept 10
Sept 19
Sept 24 - 30
Mon - Sun
October 1
Note:  Biblical Days begin at sunset.  Therefore, a Holy Day begins at sunset of the previous day listed.  For example, a Holy Day that is on Wednesday is observed from sunset Tuesday to sunset Wednesday.

* The Christian Passover service is held just after sunset of the previous day (e.g. A date of Monday for Passover means that the service is held on a Sunday evening.)

Additional Study Materials
What calendar did Jesus
and the apostles use?
Can God be worshipped
in different ways?
What happened at Jerusalem's temple
during the time of JESUS?
What is the
STAR of David?
How did God design the
INSIDE of the temple?
God's Annual Feast Days
Description of all articles
Overview of God's
Holy Days of worship
Did Jesus have a Passover, supper or communion?The Day
of Trumpets
How does God's Sacred
Biblical Calendar work?
The New Testament
Passover Ceremony
The Day
of Atonement
The Passover
Feast of Unleavened Bread
The Day
of Pentecost
The Feast of Tabernacles
The Last Great Day
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