There are many methods of astrological prediction. The most important ones are:
- Lunar return charts
- Primary directions
- Secondary progressions
- Solar arcs
- Solar return charts
- Tertiary progressions
It is not possible to make a direct comparison of the various methods to see which one is better or worse. Every astrologer will have his or her own particular approach to each method, leading to different types of explanations.
The methods are inherently different because they not only deal with different uses of planets and sensitive points but also with different periods of time. For example, a transit shows the actual movement of planets over time in relation to a natal or event chart. A secondary progression moves the planets within the natal chart according to the formula of a year in the individual's life set equal to one day of planetary movement according to an ephemeris.
To find out which themes are likely to occur at any particular moment, it is advisable to combine two or three different methods covering similar periods of time. A comparison can then show if certain themes are consistently highlighted. A study of the transits alone makes it clear how many triggers are active in any given period of time. Consequently astrologers concentrate on certain issues to avoid for the sake of clarity. Transits are the most common and simplest predictive method used, followed by secondary progressions and solar arcs.
For longer periods of time astrologers rely on predictive methods which indicate long-term developments, such as transits of the slow moving planets Saturn, Uranus, Neptune, and Pluto; whose influence can last from a few months to several years. In contrast, the most commonly used secondary progressions for long term predictions are those of the sun, Mercury, Venus and Mars which last from six months to a year. The outer planets, because they move so slowly, will normally show little change in a secondary progression chart until the native is at least in late middle age. The solar return chart is valid for one year. For more detail one can include the secondary progressions of the Moon, tertiary progressions, lunar return charts and the transits of the faster moving planets, i.e. Sun, Mercury, Venus and Mars.
One recommended way of getting a better feel for how the future might look under a given upcoming transit is to study transits retroactively to see how a person reacted or what events arose during the same or similar transits in the past.
- Reinhold Ebertin: Transits - Forecasting using the 45 degree Graphic Ephemeris, translated by Linda Kratzsch, Ebertin-Verlag, Aalen, 1973. ISBN 0-88231-122-0
- Special techniques for long-term forecasts
- Liz Greene: The Horoscope in Manifestation. CPA Press, vol 9
- Psychology and Prediction. Part One: Complexes and Projection, Part Two: A Psychological Approach to Transits and Progressions
- Robert Hand: 2002, (rev. ed., 1976), Planets in Transit. Life Cycles for Living, Whitford Press. ISBN 978-0-914918-24-0
- The definitive work on transits
- Frances Sakoian/Louis Acker: Predictive Astrology - Understanding Transits As the Key to the Future. 465 pages. Harper & Row, 1977; Harpercollins ISBN 0062720511; Grafton, 1989
- Bruno Huber and Louise Huber: Lifeclock - Age Progression in the Horoscope
- Huber method of timing in the horoscope, including age progression
- Babs Kirby, Janey Stubbs: Interpreting Solar and Lunar Returns
- A psychological and growth orientation to forecasting
- Marion March/ Joan McEvers: The Only Way to Learn About Tomorrow
- All the main methods of forecasting - progressions, directions, transits and solar and lunar returns