Planetary Aspects and Transits Software Shop
These programs run on all versions of Windows, and on Macs with an emulator. The trial versions can be made fully-functional by means of an activation key, which can be sent immediately upon purchase of a user license. Updates to new versions are free.
For each program, clicking on the Purchase button takes you to a page where you can purchase either a perpetual user license (that is, not time‑limited) or a user license (at 1/3rd the price) which is valid for just 3 months.
All software downloads from this website are completely harmless to your computer.
This page last modified on August 4, 2022.
US$59.25, €49.45 or £42.45 for a perpetual license or US$19.75, €16.45 or £14.25 for a 3-month license


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PAT is a program to calculate geocentric aspects between planets at a given
date. Also displays personal transits for a given birthdate, and
synastry for two birthdates. It identifies aspect patterns (such as
grand trines and yods) and supports searching for occurrences of them.
It has graphical and dynamical displays (as well as tabular) which show
how transits change over time, and how the position of a transiting
planet changes. It supports both tropical and sidereal zodiacs. Read more ...
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US$59.25, €49.45 or £42.45 for a perpetual license or US$19.75, €16.45 or £14.25 for a 3-month license


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This is a heliocentric version of Planetary Aspects and Transits, and does everything that that program does (except, of course, that the Moon is not included). In addition, when searching for the occurrence of a particular aspect pattern you can ask it to search for an aspect pattern involving up to three specified planets (e.g. a grand trine involving Earth and Pluto). Read more ...
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US$44.25, €37.25 or £32.25 for a perpetual license or US$14.75, €12.45 or £10.75 for a 3-month license


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YPT calculates the exact dates and times at which geocentric transits
between two selected planets begin and end (relative to chosen orb
values). It produces transit tables for both world (a.k.a. mundane)
transits and personal transits. It supports both tropical and sidereal
zodiacs. Read more ...
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US$44.25, €37.25 or £32.25 for a perpetual license or US$14.75, €12.45 or £10.75 for a 3-month license


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TAT produces transit tables showing the exact dates and times at which geocentric and heliocentric transits
between two selected planets begin and end (relative to chosen orb
values). Also allows searching for a given aspect between two planets. Read more ...
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Planets in Signs 7.24 Click on the title for the full descriptionUS$29.45, €24.75 or £21.45 for a perpetual license or US$9.75, €8.25 or £7.25 for a 3-month license

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A program to calculate when planets enter and leave the signs of the zodiac. There are two modes of operation: (1) Calculate times of entry and exit for all planets, or a selection of planets. (2) Calculate times of entry and exit of one planet across a series of signs. Read more ...
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US$29.45, €24.75 or £21.45 for a perpetual license or US$9.75, €8.25 or £7.25 for a 3-month license


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Also unlike the programs above, PSEA is not concerned with planetary transits, rather it displays, for a date or a range of dates, the times of exact geocentric aspects between planets, stars and the Moon. It also calculates declinations at those times. Read more ...
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Ephemeris 5.64 Click on the title for the full descriptionUS$29.45, €24.75 or £21.45 for a perpetual license or US$9.75, €8.25 or £7.25 for a 3-month license

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Unlike the programs above, EPH is not concerned with planetary transits but rather with the positions of the planets on the geocentric and heliocentric zodiacs, and their positions after moving forward a given number of minutes, hours, days, weeks, months or years. Read more ...
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US$29.45, €24.75 or £21.45 for a perpetual license or US$9.75, €8.25 or £7.25 for a 3-month license

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A program to convert radians to and from degrees, minutes and seconds (optionally in decimal form) and to perform addition and subtraction of angles. Read more ...
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Single-user license terms
The developer of these computational astronomy/astrology programs (Peter Meyer) is currently available for custom software development at an affordable rate. If interested please leave a message here.