Lunation, Synodical

The return of the progressed Moon, after birth, to the same distance from the progressed Sun, as that which the radical Moon was from the radical Sun at birth. This takes place once every 29½ days approximately. Each such lunation or month is considered to represent one year of life. A map of the heavens for the moment of the exact return of the Moon to this position is compared with the horoscope of birth, and treated as symbolical of the influences then prevailing. (v. Syzygy.)