The Year

The tropical year (or solar year) is the time from one March equinox to the next. The mean value is

365.2422 days. The synodic month is the time from one new Moon to the next. It ranges from 29.27

days to 29.84 days with a mean of 29.53 days.

12 x 29.53 = 354.3671

Therefore a lunar year consisting of 12 lunar months is about 11 days short of a solar year.

 

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