By referring this meridian to the sidereal time at noon on the given anniversary of birth, one determines the time before or after noon for which to erect the figure, and to calculate the planets' places.

 

An adaptation of this principle is to cast the Figure for the day when the Sun is nearest to the longtitude it had at birth, and the hour and minute when R.A. of the M.C. is the same as at birth, whereby the cusps will be the same as those in the Radix. The one method employs the Sun's position as the measure of time, and is equivalent to placing the transitory positions of the planets in a Solar Nativity; the other, to placing the transiting positions of the planets in a Geocentric Nativity. If Primary Directions are to be considered within the year, from either Figure, the time of day on which the revolution will be complete (either the Sun's return or the Ascendant's return), and the places of the planets, must be computed with great exactness for that precise moment. Otherwise it suffices to insert in the Nativity, the current noon positions of the transiting planets.

 

Modern practice considers that a lingering aspect from a Transitor, a slow-moving major planet in transit, to a radical sensitivity produces displacement of equilibrium; which is activated by an additional aspect from a Culminator, a faster moving body such as the Sun or Moon, to the same or another planet, thereby precipitating the externalization. The interpretation, however, is based not alone upon the aspected planet, but upon the entire radical configuration in which it participates, and which is thereby altered by the addition of the transiting planet's influence.