Definition:Calendar/Jewish
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Definition
The Jewish calendar is a calendar based on both the phases of the moon and on the orbital period of earth around the sun.
The whose period is based on $12$ full cycles of phases of the moon.
The basic Jewish year is $354$ or $355$ days of $12$ months, each alternately $29$ and $30$ days long.
When the error between the Jewish year and tropical year becomes approximately $30$ days, a $13$th month is inerted into the year.
Jewish Year
A Jewish year, also known as the Hebrew year, is the length of a year as defined using the Jewish calendar.
Its length is either $354$ or $355$ days, or longer, if an extra month has been inserted.
Also known as
The Jewish calendar is also known as the Hebrew calendar.
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $365 \cdotp 2422$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $365 \cdotp 24219 \, 878$