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3.7. When is the new moon?




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This article is from the Calendars FAQ, by Claus Tondering claus@tondering.dk with numerous contributions by others.

3.7. When is the new moon?

A calculated new moon is used. In order to understand the
calculations, one must know that an hour is subdivided into 1080
"parts".

The calculations are as follows:

The new moon that started the year AM 1, occurred 5 hours and 204
parts after sunset (i.e. just before midnight on Julian date 6 October
3761 BC).

The new moon of any particular year is calculated by extrapolating
from this time, using a synodic month of 29 days 12 hours and 793
parts.

Note that 18:00 Jerusalem time (15:39 UTC) is used instead of sunset in
all these calculations.

 

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