or more correctly a Synodic Month. The total of the Moon's annual travel in excess of that of the Sun, when reduced to time, gives the duration of the mean synodic revolution of the moon, or the lunar month, as 29.531 days, or 29d. 12h. 44m. 2.8s., in which period the Moon returns to its former position in relation to the Sun. The Sidereal Month is 27.322 days.
ASTROLABE ENCYCLOPEDIA
