lunation
Noun
Meaning
The period of a synodic revolution of the moon, or the time from one new moon to the next; varying in length, at different times, from about 29/ to 29/ days, the average length being 29 d., 12h., 44m., 2.9s.
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A lunation or synodic month is the mean (average) time from one new moon to the next.
The next approximation (arising from continued fractions) after the Metonic cycle (such as a 334-year cycle) is very sensitive to the values one adopts for the lunation (synodic month) and the year, especially the year.
Hipparchus confirmed this value for the lunation length.
In the J2000.0 epoch, the average length of a lunation is 29.530588 days (or 29 days, 12 hours, 44 minutes, and 3 seconds).
The Hebrew Lunation Number is the count of lunations in the Hebrew calendar with lunation 1 beginning on October 7, 3761 BC.