Transits vs progressions: what's the difference?
One is where the planets actually are. The other is a symbolic clock, and they are not comparable.
4 min read · Published 30 August 2026
The short answer
Transits are the actual current positions of the planets compared against your birth chart — real astronomy happening now. Progressions are a symbolic technique in which each day after your birth stands for one year of life, so a chart is cast for a date shortly after you were born. Transits move at real planetary speeds; progressions move about a degree per year and describe slower internal development.
The core difference
| Transits | Secondary progressions | |
|---|---|---|
| What they are | Where planets actually are today | A chart cast a few days after birth, symbolically |
| Speed | Real planetary motion | Roughly a degree per year for the Sun |
| Typical duration | Days to a couple of years | Years to decades |
| Traditionally read as | External events and circumstances | Internal development and changing needs |
| Astronomically real? | Yes — it is just the current sky | The positions are real; the day-for-a-year mapping is symbolic |
The last row matters. A transit is an observable fact — Saturn genuinely is at that degree today. A progression uses real positions from a real date, but the claim that the sky 30 days after your birth describes your 30th year is a symbolic convention with no physical basis.
How progressions work
Day for a year. The sky on the fourth day after your birth is read as describing your fourth year; the thirtieth day, your thirtieth year.
Because the Sun moves about a degree a day, your progressed Sun advances about a degree a year — changing sign roughly every thirty years, which is the slowest and most-cited event in the technique.
The progressed Moon moves about a degree a month, completing a full circuit in roughly 27 to 28 years and changing sign every two and a half. It is the fastest-moving factor and the one most practitioners watch — see progressed Moon cycles.
AsterNym computes progressions from an actual chart cast at the progressed moment rather than by adding degrees arithmetically, and shows the date it used on your natal chart.
Which to use for what
- Outer planet transits for major life chapters. Saturn, Uranus, Neptune and Pluto move slowly enough that a contact lasts one to two years — see outer planet transits.
- Progressed Moon for emotional chapters of two to three years.
- Progressed Sun sign change for the rare, decades-apart shift in overall direction.
- Fast transits — Moon, Mercury, Venus, Mars — for day-to-day texture, and with appropriate scepticism, since something is always transiting something.
- Solar arc as a third layer, covered in solar arc directions.
The honest limit
Neither technique has been shown to predict events. What both can honestly offer is a frame for a period — a way of naming a stretch of time and asking what it is about.
The specific failure mode to avoid is treating a transit as a forecast and then waiting. A difficult Saturn transit that produces nothing was not wrong, because it never made a checkable claim; that unfalsifiability is exactly the problem set out in is astrology a science.
Used as a prompt to review something you have been avoiding, a timing technique does useful work without needing to be causal.
Common questions
- What is the difference between transits and progressions?
- Transits are the actual current positions of the planets compared to your birth chart. Progressions are symbolic: a chart cast for a date shortly after your birth, where each day stands for one year of life. Transits describe circumstances, progressions internal development.
- How fast do progressions move?
- The progressed Sun moves about a degree a year, changing sign roughly every thirty years. The progressed Moon moves about a degree a month, changing sign every two and a half years and completing a circuit in 27 to 28 years.
- Are progressions astronomically real?
- The positions are real — they come from an actual date shortly after your birth. What is symbolic is the mapping: the claim that the sky thirty days after birth describes your thirtieth year is a convention with no physical basis.
- Which technique should I use?
- Outer planet transits for major chapters lasting one to two years, the progressed Moon for emotional periods of two to three years, and the progressed Sun's sign change for rare shifts in overall direction. Fast transits deserve the most scepticism, since something is always transiting something.