The average length of the synodic month is 29.530589 days . Thus it is convenient if months are in general alternately 29 and 30 days ( sometimes termed respectively "'hollow "'and "'full "').
32.
There are 13.944335 synodic months in a full moon cycle, the 251-month cycle approximates the full moon cycle to 13.944444 synodic months and the 767-month cycle approximates the full moon cycle to 13.9454545 synodic months.
33.
There are 13.944335 synodic months in a full moon cycle, the 251-month cycle approximates the full moon cycle to 13.944444 synodic months and the 767-month cycle approximates the full moon cycle to 13.9454545 synodic months.
34.
There are 13.944335 synodic months in a full moon cycle, the 251-month cycle approximates the full moon cycle to 13.944444 synodic months and the 767-month cycle approximates the full moon cycle to 13.9454545 synodic months.
35.
Because there are slightly more than twelve lunations ( synodic months ) in a solar year, the period of 12 lunar months ( 354.367 days ) is sometimes referred to as a "'lunar year " '.
36.
Since a tropical year is 365.2422 days, and a synodic month is averaged 29.53059 days, in nineteen years the solar and the lunar calendars will only differ by about two hours, or 1 part in 80, 000.
37.
Considering a year to be of this 6, 940-day cycle gives a year length of 365 + + days ( the unrounded cycle is much more accurate ), which is about 11 days more than 12 synodic months.
38.
This orbital period is called the anomalistic month, and together with the synodic month causes the so-called " full moon cycle " of about 14 lunations in the timings and appearances of full ( and new ) Moons.
39.
The mean period of the lunar month ( precisely, the synodic month ) is very close to 29.5 days . Accordingly, the basic Hebrew calendar year is one of twelve lunar months alternating between 29 and 30 days:
40.
VII . 2 . II ) and ?T ) we estimate that the error in the assumed length of the synodic month was less than 0.2 seconds in the 4th century and less than 0.1 seconds in Hipparchus's time.
