Transits
Tropical reference · Placidus houses when birth time is known. Unknown-time studies omit houses and angles.
Every contact the moving planets make to your birth chart: when it comes into orb, each exact pass, and when it leaves. The calculation is free; Urania's full reading of a transit is Enhanced. Method, limits & sources
Enter a birth date, time and place, choose a calculation span, then Show my transits.
What this page answers
Transits are the aspects the moving planets make to the positions in a birth chart. This calculator shows when each transit comes into orb, every exact pass (including retrograde returns) and when it leaves, for any span from birth onward, up to three calendar years at a time. The calculation, including the minor aspects, is free; Moira Enhanced adds Urania's full personalised reading of a transit.
Method, limits & sources
- Method
- The birth chart is cast from the entered date, time and place. The planets' daily positions over the chosen span are compared with each natal planet, the lunar node and, when the birth time is known, the Ascendant and Midheaven; exact moments are refined to the minute from NASA JPL ephemeris positions. The zodiac is tropical, with Placidus houses when the birth time is known. Sun, Mercury–Pluto and selected supported asteroids are available in longer studies; the This week view also includes Moon contacts.
- Important limit
- Transit meanings are astrological conventions, not scientifically established effects or guarantees about events. Orbs are a convention too; a different orb moves the dates a transit enters and leaves. Without a birth time the houses and angles are left out. Window boundaries and unrefined pass times are sampled estimates; refined pass timing is marked wherever the engine returns it for the inspected cycle.
- Provenance
- The page separates the calculated timing from interpretation and links the result back to Moira's chart and validation context.