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Software to calculate geocentric and heliocentric astrological aspects, world transits, personal transits and synastry

What's a planetary transit?

Planetary aspects occur when two planets possess a particular angular relationship with each other (e.g. conjunction, opposition, trine, square, etc.) with respect to a central point. This point is either the Earth (in geocentric astrology) or the Sun (in heliocentric astrology). A planetary transit is the period during which two planets remain continuously in a particular aspect with each other. The programs described here either display planetary aspects and transits or calculate the exact dates and times at which transits occur (begin and end) between selected planets. Click on any of the program titls or screenshots for more information about a particular program (and the user manual). Or to get short descriptions of these programs visit our software shop.

Astrology without houses

In case you were wondering why this software makes no mention of astrological houses, the reason is that a house is a concept based on the rising sign, which depends on a position on the Earth (latitude and longitude). Aspects between planets, and thus planetary transits, depend only on the motion of the planets along the ecliptic, relative to the center of the Earth (or the Sun). Thus a planetary transit does not require an ascendant (and thus no house system). Aspects and transits have their own astrological meaning. (Yes, astrology without houses is possible.) Signs are as usual, for example, Neptune is in Pisces from April 4, 2011, through March 30, 2025; and see this Su‑Me‑Sa‑Pl 4‑stellium in Capricorn on January 12, 2020).

These programs run under any version of Windows from XP to 10. The downloadable trial versions can be made fully-functional by means of an activation key which can be sent immediately upon purchase of a user license (or can be obtained soon after). Updates to new versions (if any) are free.