Paganlink Software : Astrology : Astrolog


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Astrolog: currently used in over 35 countries on six continents!

Astrolog is relatively unique in astrology software for the following reasons:

  1. It's 100% freeware. :)
  2. It runs on multiple platforms, such as DOS, Windows, Mac, and Unix.
  3. The full source code is available.
  4. Features are accessible from the command line and from shell scripts.
  5. It offers many features not found in most other programs.

"The Best Freeware/Shareware Program of 1995 is Astrolog for Windows" - American Astrology, March 1996

"One exceptionally good freeware program is available to astrologers - good enough to be worthy of review with the main commercial programs. This is Astrolog..." - The Mountain Astrologer, November 1995

"For a free program to have such a superb ephemeris with an 8000-year range is incredible." - American Astrology, November 1994

Astrolog features: wheels, aspects, midpoints, relationship charts, transits, progressions, some interpretations, astro-graphy, local horizon, constellations, planet orbits, dispositors, various influence charts, biorhythms, different zodiacs, central planets, 14 house systems, 8400 year ephemeris, asteroids, Uranians, fixed stars, Arabic parts, script files and macros, interactive PC & MS/X11 Windows graphics, smooth animation of charts, graphic files in PostScript, Windows metafile, and bitmap formats, and more!

A list of the main features in Astrolog:

  • Position calculation features:
    • Positions of Sun through Pluto and the house cusps.
    • Positions of Chiron and the four main asteroids.
    • Positions of True and Mean nodes, Part of Fortune, Vertex, and East Point.
    • Positions of Lilith.
    • Positions of the eight Uranian planets.
    • Positions of over 40 fixed stars.
    • Positions of over 170 Arabic parts and their formulas.
    • Option to use any or all of accurate 8400 year ephemeris.
  • Computation features:
    • Fourteen house systems.
    • Tropical and sidereal zodiac.
    • Specify zodiac starting position / ayanamsa.
    • Heliocentric and other planet centered charts.
    • Applying and separating aspects.
    • Parallel and contraparallel aspects.
    • Harmonic charts.
    • Solar charts with objects on Ascendant or Midheaven.
    • Decan positions.
    • Navamsa positions.
    • Specify your own positions for planets.
    • Positions relative to ecliptic or equator.
    • Local horizon positions in prime vertical coordinates.
  • Display formats:
    • Generic position listing.
    • Wheel charts.
    • Hindu or Vedic format wheel charts.
    • Aspect and midpoint grids.
    • List aspect configurations such as Yods.
    • List aspects sorted by influence.
    • List midpoints sorted by position.
    • Local horizon positions.
    • Times of planets rising and setting.
    • Solar system orbit charts.
    • Gauquelin sector charts.
    • Astro-graph charts.
    • List latitude crossings in astro-graph charts.
    • Generic monthly and yearly calendars.
    • Ephemeris tables.
    • Biorhythm charts.
  • Transit and progression features:
    • Secondary progressions and solar arc progressions.
    • Specify your own progression rate.
    • Times of exact aspects among transiting planets.
    • Times of planets changing sign or direction.
    • Times of lunar phases and season changes.
    • Times of exact aspects in a progressed chart.
    • Times of exact transit hits.
    • Times of transits to house cusps.
    • Times of solar, lunar, and other returns.
    • Times of exact transits from progressed planets.
    • List transits to natal planets within orb in influence order.
    • List aspects within orb among transiting planets in influence order.
    • Transits to composite and other no-time charts.
  • Relationship chart features:
    • Synastry charts.
    • Composite charts.
    • Time space midpoint charts.
    • Weighted relationship charts.
    • Display elapsed time between charts.
    • Aspect and midpoint grids between two charts.
    • Aspect and midpoint lists between two charts.
    • Automatic progressed to natal comparison chart.
  • Interpretation features:
    • Influence charts sorting planets and signs by power.
    • Interpret natal positions and natal aspects.
    • Interpret transits and midpoints.
    • Interpret transiting aspects and sign and direction changes.
    • Interpret aspects and midpoints between charts.
    • Interpret synastry charts.
  • Graphics features:
    • Graphic wheel chart.
    • Graphic bi-wheel comparison / transit chart.
    • Graphic tri-wheels and quad-wheels.
    • Graphic aspect / midpoint and relationship aspect / midpoint grids.
    • Graphic astro-graph chart on a map of the world.
    • Graphic local horizon, polar horizon, Gauquelin wheel, and orbit charts.
    • Graphic ephemeris tracking chart.
    • Graphic calendars and biorhythms.
    • Dispositor graph chart.
    • Plot positions among the astronomical constellations.
    • Smoothly animate charts through time at varying rates.
    • Continuously update chart to current moment now.
    • Animate a rotating globe.
    • Timed exposures for horizon and orbit charts.
    • Create PostScript graphic files.
    • Create graphic X11 and Windows bitmap files.
    • Create Windows metafiles.
  • Customization options:
    • Initialization file for default settings.
    • Choose what transiting and natal planets to include in charts.
    • Choose among 18 major and minor aspects, or define your own.
    • Specify aspect orbs.
    • Specify the maximum orb allowed to a planet.
    • Specify wider orbs for any planet.
    • Display zodiac positions to the nearest second.
    • DMY & MDY date formats and 24 hour & am/pm time formats.
    • Display locations in hours & minutes or 360 degree form.
    • Customize interpretation strings.
    • Customize colors.
    • Define your own orbital elements for planets.
    • Choose among graphic glyphs for certain signs and planets.
    • Specify influence of planets and planets when transiting.
    • Specify influence of houses and aspects.
  • Chart access features:
    • Quick charts for the current moment now.
    • Save and load chart time and place to file.
    • Save and load chart positions to file.
    • Save text output directly to file.
    • Relocate charts.
    • Cast a chart a specified time ahead of any chart.
  • System features:
    • Display text charts in Ansi color.
    • Paging for when text charts are more than a screenful.
    • Access environment variables.
    • Define macros for your most common operations.
    • Easy to use menu and dialog interface in the Windows version.


For PCs, 640K of RAM and a reasonably recent version of DOS. A math co-processor chip is recommended for best performance but not required. Astrolog can take advantage of Ansi text, CGA, EGA, VGA, and SVGA graphics but they are not required. The program will run on 8088 AT and XT systems and higher x86 processors. The DOS version of Astrolog may be run from MS Windows in a DOS box.

For compiling the source code for PCs, the Microsoft C compiler version C6 or later, or Borland Turbo C/C++ compiler version 3.0 or later. Other compilers should work although one will probably have to compile out the screen graphics sections.

For the Windows version, at least 2M of RAM and Windows 3.1 or later. Astrolog for Windows will run under Windows for Workgroups, Windows '95, and Windows NT. For compiling the Windows version, Microsoft Visual C version 1.5 or later is recommended, although most any Windows compiler should work provided it can compile resource files.

For Unix systems, some C compiler is required since ready to run executables aren't available (with the exception of a couple of Linux versions). Astrolog can take advantage of X11 but this is not required.

Astrolog will compile and work on VMS systems, even with X Windows, but this isn't officially tested. A .COM makefile script is included.

On the Macintosh Astrolog will compile and run with every feature including some interactive graphics, using for example the Symantec C/C++ 7.0 compiler for the Mac. It will run on any reasonably recent 68K Mac with 750K free, and will run on PowerMacs in emulation mode.

A few third party ports of Astrolog are publicly available. This includes a port of Astrolog version 4.00 to OS/2 Presentation Manager by David Serls, a port of Astrolog 2.2.5 to the Macintosh but with interactive graphics by Pascal Lamboley, and a port to the Amiga by Tobias Ferber.


Walter D. Pullen


Free to use and distribute, but not to sell.

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