Transits for Astro‑Trading
Transits for Astro Traders

A Windows Program to Calculate Exact Dates of Geocentric and Heliocentric Planetary Transits

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Jupiter-Uranus square 2013
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World planetary transits (a.k.a. mundane planetary transits) occur when two moving planets possess a particular angular relationship (called an aspect) with each other (e.g. conjunction, opposition, trine, square, etc.) with respect to a central point, which is either the Earth in geocentric astrology or the Sun in heliocentric astrology. A transit (more exactly) is the period during which two planets remain continuously in a particular aspect with each other. This software calculates the exact dates and times at which transits between selected planets (including the Sun in geocentric astrology, and the Earth in heliocentric astrology) begin and end (relative to chosen orb values from 1° to 15°).

This software uses a new method for displaying the periods of planetary transits, known as transit tables. The two transit tables below (for orbs of 5°, 3° and 1°) show that heliocentric transits differ significantly from geocentric transits. This is because in geocentric astrology (but not in heliocentric astrology) a planet may be retrograde (that is, appear to move backwards). Consequently transits are much more regular in heliocentric astrology than in geocentric astrology, as the geocentric and heliocentric transit tables below show (only conjunction, square and opposition are included):

geocentric transit table
heliocentric transit table

The heliocentric conjunctions of Jupiter and Saturn occur once every twenty years (and a few months). The period varies due to the variation of the speed of these planets in their elliptical orbits around the Sun.


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Trial version: A trial version of Transits for Astro‑Trading can be downloaded from this website for the purpose of evaluation of the software. Click on the following link for further information:

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Price and ordering: A single-user license is available for a period of 3 months, 1 year or with no time limit (a 'perpetual' license). Prices for each type of license are given at Purchase a User License. An activation key is required in order to make the trial version permanently fully functional, and can be obtained immediately (or soon after) your purchase.

Combo offer: If you can pay via PayPal then you can obtain a discount of up to 38% by purchasing 2, 3 or 4 programs at once. For this go to our Software Shop.

Refund: A refund will be provided promptly up to 30 days after purchase if the software does not perform satisfactorily.

Updates: Purchasers of a user license for this software are entitled to an update to any later version at no additional cost.