Software to calculate geocentric and heliocentric planetary positions,
aspects, aspect patterns, world transits, personal transits and synastry
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Until November 30th you can obtain a 50% discount on all programs on this site (perpetual user licenses only) if ordering via Comecero. To get this discount, enter half-price-today as the discount code at the Comecero order form.
November 29, 2020, 12:00 GMT
Julian date: 2,459,183.00
Ecliptic longitudes Planet Geocentric Heliocentric Sun 247°44' 7Sag44 Mercury 236°22' 26Sco22 209°30' 29Lib30 Venus 219°50' 9Sco50 179°57' 29Vir57 Earth 67°44' 7Gem44 Mars 16°45' 16Ari45 48°14' 18Tau14 Jupiter 295°51' 25Cap51 304°8' 4Aqu8 Saturn 298°16' 28Cap16 302°39' 2Aqu39 Uranus 37°34' 7Tau34 39°0' 9Tau0 Neptune 348°10' 18Pis10 350°2' 20Pis2 Pluto 293°14' 23Cap14 294°25' 24Cap25 Moon 57°52' 27Tau52
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There are several different types of astrology program. One difference is whether the program concerns geocentric astrology, heliocentric astrology, or both. In geocentric astrology the zodiac is viewed from the perspective of the Earth, whereas in heliocentric astrology it's from the perspective of the Sun. Most astrological software is geocentric, but astro-tradng programs often use a heliocentric zodiac. Among the five astrology programs shown below, three are purely geocentric, one is purely heliocentric, and one supports both zodiacs.
The program below run with all versions of Windows, and on Macs with an emulator such as "Parallels". Trial versions are freely downloadable can be made fully-functional by means of an activation key after purchase of a user license (via credit/debit card or Bitcoin). Updates to new versions are free. For more details and to purchase a license either click on an image below or visit our Software Shop.
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 titles 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
The reason that none of these four programs involve an ascendant, or astrological houses, is that the ascendant (and thus any house system) depends on a geographical position (usually a birthplace). But aspects between planets, and thus planetary transits, depend only on the motion of the planets along the ecliptic as viewed from the Earth (or the Sun). Thus a planetary transit does not require, or imply, an ascendant (and thus no house system). Aspects and transits have their own astrological meaning. (Yes, astrology without houses is possible.) Signs (derived from the equal division of the ecliptic) 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). For a heliocentric example see this double kite.
There are 7 house systems commonly used by astrologers, and over 20 are possible. They give different results when interpreting a horoscope (and the Koch and Placidus systems don't even work for all latitudes). Which gives the "correct" interpretation? Or should we just conclude that the "meanings" given to houses are (arbitrary?) choices made by astrologers long ago, uncritically passed from generation to generation, and that only aspects (especially aspect patterns) and transits are important (and still to be properly interpreted)?
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.
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