profectionis

Profectionis is an astrological technique used in Hellenistic, medieval, and Renaissance astrology. It involves advancing a person's birth chart by one year at a time, using the sign that the ruler of the ascendant occupies in the natal chart as the key for the profection year. For example, if someone is born with Aries rising and Mars is in Taurus in their natal chart, their first profection year (age 0-1) would be governed by Taurus, and their second profection year (age 1-2) would be governed by the sign where Mars falls in their second year.

Each profection year is associated with a specific house in the natal chart, determined by the sign occupied by the ruler of the ascendant. The house that the ascendant ruler falls into becomes the "profected house" for that year. The planets located in that significator sign and house, as well as the planets that aspect the significator, are considered particularly important for the events and themes of that year.

The profection system is often used in conjunction with other astrological techniques, such as primary directions and transits, to provide a more nuanced interpretation of an individual's life path and potential events. It is a predictive method that aims to highlight the areas of life that will be most active or influential during a given period. The practice of profectionis has seen a resurgence in modern astrology, particularly among those who study traditional astrological methods.