As will be argued in the conclusion, this move away from sidereal astrology may possibly be linked to the thirteenth-century emergence of Paris as a major European center for the study of astrology. One of few possible ways to specify the zero point of the sidereal Zodiac is to use the point 180 opposite to the star Spica location at the year of 285 AD. Basing itself on printed sources as well as unpublished manuscript material, it provides evidence that a commitment to sidereal coordinates united several important figures during the early phases of the assimilation of Islamic mathematical astronomy in Latin Europe, but largely disappeared after 1250. Spica is one of the 15 Behenian root stars especially suitable for magical applications. Supports both the tropical and sidereal zodiac models. Advanced astrological features include the fixed stars, planetary hours calculator with an alarm and many more. This article makes a first step by documenting cases from the twelfth and thirteenth centuries where Latin astrologers employed the sidereal zodiac for their calculations or expressly recommended its use for astrological purposes. Time Nomad is a free astrology app for iPhone and iPad that casts astrological charts for any location including natal charts, transits, synastry and progressions. While this basic bifurcation in medieval computational astronomy is well known to modern scholars, there has so far been no systematic research concerning its consequences for the practice of astrology in this period. Sets of astronomical tables available in Latin Europe during the Middle Ages can be classified based on whether they imitated Ptolemy in using a tropical zodiac for displaying planetary mean motions or followed an Indian tradition of preferring a sidereal reference frame.
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