NT Bible Model:
Add 1 day 12 hrs to Astronomical New Moon time. Adjust for sunset.
See Historical update below.

Looking for a Jewish calendar and opened this page by mistake? Go here:
Colel Chabad calendar page
this is a well known Jewish site. Their spiel [or similar] gives:
Colel Chabad was established in 1788 by Rabbi Schneur Zalman of Liadi, founder of the Chabad-Lubavitch movement, also known as the Alter Rebbe and the Baal HaTanya. ...
Colel Chabad works hand in glove with municipal Governments throughout Israel ...
Colel Chabad is by far the largest charitable organization of its kind in Israel, ...

2320. chodesh, kho'-desh; from 2318; the new moon; by impl. a month:--month(-ly), new moon.
Strong's Exhaustive Concordance of the Bible.

For as the new heavens and the new earth which I will make shall remain before me, says the LORD; so shall your descendants and your name remain.
From new moon to new moon, and from sabbath to sabbath, all flesh shall come to worship before me, says the LORD.
Isaiah 66:22,23.

2023 proposed New Moon worship days according to the NT Bible Model

New Moon Worship days for 2023 using the NT Bible Model
New Moon Worship days for 2023 using the NT Bible Model
New Moon Worship days for 2023 using the NT Bible Model
Data from

Only need sunset time checks for 21 Apr, 19 Jun, and 16 Sep. Probably didn't need 16 Sep.

And an interesting note:
These table dates were obtained from the site. And one date looks different to the NASA /AstroPixels Moon Phase data.
13 December.
The NASA/AstroPixels data give 12 December 23:32:

Image: NASA new moon phases 2023
Image: NASA new moon phases 2023
Image: NASA new moon phases 2023

These tables are UTC/GMT times. When we adjust for Jerusalem [add 2 hours] and no daylight saving we get the same as above.
23:32 + 2 hours = 25:32 or 1:32am the following day or 13 December.

NT Bible Model: Add 1 day 12 hrs to Astronomical New Moon time. Adjust for sunset.

Historical update
Late 2014 a search was undertaken using different new moon models to find the crucifixion date. 4 years were tried and a Friday date was obtained using the Waxing Crescent approach. A Friday date was also obtained with the Beginning of the Dark Phase approach. But with the weight of historical quotes supporting the Waxing Crescent, and given that we did find a Friday date using it, the safest conclusion to draw is clearly that it is the better choice of the methods.

So the results of this search were twofold. We obtained a very likely date for the crucifixion of Christ. And we determined that the most likely new moon worship day of the Bible is the waxing crescent.

From late 2011 through 2014 the NT Bible Model was used to approximate new moon worship days according to the beginning of the dark phase of the moon. From 2015 the model has been used for the waxing crescent instead.

Proposal selection amendment/update for 2022 onwards
Using the numerical 1.5 day point as the beginning of the new moon day a simplified amended proposal follows:
From sunset onwards select the following day since in theory the days are kept from sunset to sunset. If the numerical value falls before sunset also use that day.
Using this approach sunset time checks would only be needed in these curious afternoon decisions.
Also a more laid back approach will be to ignore the following day if the end of the numerical day is in the early morning during the dark part of the day.

Data obtained from
The Bible model is a little different to the current Jewish approach.

The Jewish approach of using Molad dates and times does not strictly follow the true lunar synodic month through the year. The length of the synodic month changes through the year and the Jewish calendar does not allow for this and can actually get a little out of step. And some years it can get completely out of sync.*

The Jews are aware of these length discrepancies and readily admit them.

The NT Bible model approach uses a numerical value to follow the astronomical new moon date. As the synodic month length changes the position for the new moon worship day adjusts accordingly.

The numerical value obtained was 1 day and 12 hours from the astronomical new moon date and time. This value was tested using the Jewish calendar for the year 2011 by adding the value to the astronomical new moon date and time. For every month tried the numerical approach was successful in landing on a Jewish Rosh Chodesh date. When the Jewish calendar had two dates in the same month the numerical value was successful in landing on one of them.

Also, according to the Bible construction for a day, New Moon worship days are from sunset to sunset.

The Jewish approach of using two chodesh dates when the numerical value falls near a sunset time is here taken. At present Jerusalem times are being used but the reason for this is purely geographical, not Jewish. If the command from God was given to Moses then it is clear the location is somewhere near the region of Palestine. Using Jerusalem times should solve any problem here.
All the reasons for the above [except Jerusalem] are given in my study
The Search for Chodesh

* It got completely out of step in 2013. This was one of those out-of-sync years. See the PostScript section at the end of my Search page link above.

Image:Isaiah 66:22,23
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E-mail: stephen [at]
Last revised: 31 Dec 2022.
Construction: 20 Nov 2011.
Note: calendar may update separately.

Page design/construction 2011.