For web-based free astrology calculations on any computer system with internet access, go to:

This is actually the website. Click on Extended Chart Selection, near the bottom of the page, 2nd column.

To get the midpoints, click on:       Pullen/Astrolog
Then choose from the pop-up menu:  Aspect/midpoint grid chart

Another easy free web-based astrology site is

Some other great free websites:
Free Astrology Calculators

Free Ephemeris text files:

A great free astrology program aimed at Windows users:

... by Walter Pullen. Some of this program is actually used by Astrodienst in their free astrology zone.

Runs on Windows and Mac. The Mac version is for non-intel chips only (G4, G5, etc) and is only run as a command line tool. It's not the most user friendly program and takes a little time to get used to, but is very accurate and has lots and lots of features.

see also:
For reviews of many other astrology programs for sale see:

TimePassages 5 for the Mac has a beginner's version which is $49.95 and is great software for the Mac in that price range:

Great list of astrology app for iPhone (but not necessarily free): 

Here's a collections of free, open-source astrology software:

* This article started as a follow-up to a discussion about astrology software we had in class at Carroll Righter's.

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