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gfa-basic
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Free, open source astrology program for Windows and Linux. Birth charts in seven house systems with topocentric parallax, transits, directions, solar and lunar returns, Munich rhythm theory. Robert Rettig's HORCOM (1989 to 2010), ported to C++20 and Qt 6.
desktop-app windows linux astronomy ephemeris astrology appimage atari-st horoscope cpp20 software-preservation astrologie transits gfa-basic birth-chart natal-chart qt6 house-systems solar-return astrology-software
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Updated
Oct 27, 2026 - C++
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