Astrolog

Astrolog is an astrology software program that has been available online free of charge since 1991. It was originally authored by Walter Pullen, and distributed via postings to the Usenet newsgroup alt.astrology.

Astrolog can create horoscopes, natal charts, and calculate current planetary positions in sidereal, traditional, and heliocentric formats. It can be used to relate astrological house and sign dispositors and other nonstandard systems. Astrolog uses 16 different house systems, can calculate 18 different aspects such as trines, squares, semisquares, and rarer ones such as biquintiles, quatronoviles, and sesquiquadrates. Astrolog computes the traditional planets, along with minor planetary objects such as Ceres, Juno and Vesta, and uranian objects such as Vulkanus and Russian Proserpina. It can show nearly 50 fixed stars, and animate the chart in real time synchronized with the OS clock. Astrolog can do forms of locational astrology such as astrocartography.