Transits (行運)
Astrological Forecasting — the Sky's Dialogue with Your Chart
Overview
Transits are how Western astrology forecasts time. As the planets continue to move after your birth, they form aspects to your natal chart — and those moving contacts describe the themes, opportunities, and challenges of a given period. The slow outer planets (Jupiter, Saturn, Uranus, Neptune, Pluto) mark the meaningful chapters of a life; the faster Sun, Moon, and Mercury colour the texture of a day.
Origin & history
Transit astrology descends directly from the ancient practice of watching the sky in relation to a birth moment. The technique was central to Hellenistic and medieval astrology and remains the primary forecasting tool of modern Western practice.
Where ancient astrologers tracked transits by hand against tables, modern software computes them instantly. The Saturn return (~age 29), the Jupiter return (~every 12 years), and the outer-planet transits to personal points have become widely-known cultural touchstones, keeping transit astrology among the most popular forecasting methods.
How it works
The natal chart is computed from birth data, and the positions of the ten planets are computed for the transit date. The engine measures every aspect a transiting planet makes to a natal planet; the slow outer-planet transits are flagged as 'major' (the chapters), the inner-planet contacts as 'minor' (the daily weather). A supportive-vs-testing balance of the major transits yields an overall weather read and a 0–100 score.
Good for
- Timing decisions and launches
- Understanding the current chapter
- Anticipating challenges and openings
- Saturn-return and outer-planet milestones
- Daily and weekly astrological weather
- Pairing forecast with natal and synastry readings
Use cases
Today's Weather
Enter a birth date (and optionally a transit date) and receive the active transits — the major outer-planet contacts that mark chapters, the minor daily contacts, and an overall supportive-vs-testing read.
Timing a Decision
Supportive transits (trines, sextiles, soft conjunctions) point to open windows; testing transits counsel patience and consolidation.
Milestone Transits
Track the Saturn return, Jupiter return, and the once-in-a-lifetime outer-planet transits that classical astrology treats as turning points.
Forecast Layer
Combine transits with the natal chart and synastry to give an agent or reading a time dimension — what is active now, not just who someone is.
Key terms
- Transit
- A current planetary position forming an aspect to a natal planet — the basis of astrological forecasting.
- Major transit
- An aspect from a slow outer planet (Jupiter–Pluto) to the natal chart; these mark the meaningful, multi-month-to-multi-year chapters.
- Saturn return
- The ~29-year transit of Saturn back to its birth position, a hallmark period of maturation and structural change.
- Applying / separating
- Whether a transit is moving toward exactness (applying) or away from it (separating) — applying contacts are building, separating ones waning.
API
The askTIAN Transits API aspects the planets of any date to a natal chart on a verified pure-JS ephemeris, separating the major outer-planet transits (the chapters) from the minor daily contacts, with a supportive-vs-testing weather read and a 0–100 score. Defaults to today; pass a transit date for any moment.
Endpoint: POST /trpc/forecast.transits — 3 TIAN Points. See the API documentation and Playground.