The Jewish calendar is a lunar one, based on the 29 1/2 day revolution of the moon around the earth.
(The Jewish calendar; is; a lunar one, based on the 29 1/2 day revolution of the moon around the earth) (a lunar one; based; on the 29 1/2 day revolution of the moon around the earth)
The Jewish calendar a lunar one
is based
a lunar one, based on the 29 1/2 day revolution of the moon around the earth
on the 29 1/2 day revolution of the moon around the earth