Tertiary Progression

Tertiary progressions are a predictive method. There are two kinds of tertiary progressions: I (T I) and II (T II). In the first method, T I, each day after the day of birth is equivalent to one lunar month in an individual's life, and in the second method, T II, each synodic month after the day of birth is symbolically equivalent to one year in a person's life. Both methods are rarely used which doesn't, however, mean that they are of little value.

Tertiary methods of progression differ from some of the more commonly used secondary progressions in that they can also be applied to the slow moving planets Saturn, Uranus, Neptune and Pluto, in addition to Jupiter which is relatively slow-moving. With secondary progressions, these planets barely move and therefore hardly play a role in astrological interpretation.

The secondary progressions are related to the Sun's movement whereas tertiary progressions are based on the movement of the Moon.

Interpretation

The main factors in T I progressions are:

• A new phase begins when a planet moves from one sign to the next.

• Important triggers are stationary phases

and eclipses which aspect planets and axes in the natal chart, also aspects (especially the conjunction, opposition or square) from (tertiary progressed) axes and planets to axes or planets in the natal chart.

The same factors also play a role in T II tertiary progressions, although it makes more sense to include - with the rather obvious exception of eclipses - the planets Jupiter, Saturn, Uranus, Neptune and Pluto, presuming short term triggers are not the main focus of attention.

Periods of time

Both methods of tertiary progression are concerned with much smaller periods of time than secondary progressions and are therefore useful for making detailed short-term predictions. With T I, the Sun moves roughly one degree per month which makes it equivalent to the secondary progressed Moon. It can also be used to measure the average diurnal movement of the other planets. With the T II method, the planets move at one twelfth of their actual speed: for example, the Moon moves around one degree instead of twelve and the Sun around 2 1/2 degrees in one month instead of around 30 degrees.

Axes

Various methods can be used to progress the horoscope axes. The simplest method is solar arcs which moves the Medium Coeli in line with the (tertiary) progressed Sun so that the angle between the Sun and the MC in the tertiary progressed chart always remains the same as the angle in the natal one. The movement of the other house cusps is based on the movement of the Medium Coeli.