Tertiary Progression

A method of progression based on the premise that a day in the Ephemeris is equal to a lunar period. Ration of 1 = 27.32' The tropical lunar month (27.32158 days), the sidereal lunar month (27.32166 days), and the synodic lunar month (29.53059 days). Thus, 300 days after birth correspond to 300 lunar periods into a person's life, or, depending on the period used, about 22.5 years (for the first two) or 24.25 years (for the third) after birth.