Calculation of geocentric and heliocentric planetary positions, planetary aspects,
world and personal planetary transits, and synastry

The software described on this website runs on Windows desktops and laptops (including Win11).
For each program below, clicking on title takes you to a page with the user manual.

The author of this software and website, Peter Meyer,
may be contacted at support@planetary-aspects.com

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Planetary Aspects and Transits 26.1 Click on the title for the full description.

This 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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Heliocentric Planetary Aspects and Transits 30.0 Click on the title for the full description.
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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Your Planetary Transits 10.0 Click on the title for the full description.
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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Transits for Astro‑Trading 12.0 Click on the title for the full description.
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 ...