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

Planetary Aspects
and Transits

Heliocentric Planetary Aspects
and Transits

Your Planetary Transits
Transits for Astro-Trading

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 screenshots at right for more information about a particular program. 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 the position on the Earth (latitude and longitude) of a hypothetical observer (at a given time). Aspects between planets and planetary transits depend only on the observed (or calculated) motion of the planets along the ecliptic, relative to the center of the Earth (or the Sun). Thus a planetary transit does not imply 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 (e.g., 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).

Details of the ranges of admissible dates for these programs are given at Date Ranges.

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


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