☉Western astrology · 5 min
The birth chart is the "baseline", but astrological tradition also looks at change over time: the phases and turning points of life. There are three main methods: transits, progressions and returns. All three rest on the same idea: the movement of the sky is a "clock" against which the birth chart can be compared.
Transits
A transit is the current position of a celestial body relative to the points of the birth chart. If, for example, transiting Saturn passes over the natal Sun, a traditional reading says this may be a period of responsibility, limits and reassessment. The transits of the slow planets (Jupiter, Saturn, Uranus, Neptune, Pluto) are considered the most significant because they act on one point for months or even years.
The Saturn return
Saturn orbits the Sun in about 29.5 years, so around the age of 29 to 30 it returns to its natal position. This is the Saturn return, regarded in tradition as the "threshold of maturity": a stocktaking of the first adult phase of life. Developmental psychology also recognises that many people reassess their life path around thirty (Daniel Levinson called it the "age thirty transition"), but that is not evidence that Saturn causes it. Similar milestones are the Jupiter return (about every 12 years) and the Uranus opposition (around age 42).
Secondary progression
Secondary progression is based on the "a day for a year" principle: the sky on the nth day after birth symbolises the nth year of life. The progressed Moon changes sign about every two and a half years, the progressed Sun about every 30 years. According to tradition this is the gauge of inner, slowly maturing change. There are other progression methods (for example solar arc directions), but the secondary one is the most widespread.
Solar and lunar returns
The solar return is the moment each year when the Sun returns exactly to its natal position (around the birthday). A new chart is cast for that moment and is regarded as the "horoscope of the year". The lunar return is the same with the Moon, about every 27.3 days. The chart also depends on where the person is at that moment, which is a disputed point in tradition.
How to use them meaningfully
- As a calendar for reflection: you can use the dates of transits to pose questions ("What would I like to rethink now?").
- As a symbolic frame: they can help to name a phase, but they do not explain the experience.
- Not as prediction: no one can say what will happen.
Scientific status
The predictive power of astrological timing methods has not been confirmed in controlled studies. It often happens that readings about transits "come true" in hindsight; this is explained by confirmation bias and the Barnum effect: a sufficiently general sentence fits many kinds of life situation. If you use transits for turning points in your life, check what you recorded in advance and what you made up afterwards.
A useful test: write down in advance what you expect from a given period, then compare it with the outcome at the end.