Placidus system - Method of house division, named after the 17th century astrologer Placidus de Tito, using time division to trisect the diurnal semi-arc.
It is thought the Placidus system was first mentioned about 13th century in Arab literature, but the first confirmed publication was in 1602 by Giovanni Antonii Magini (1555-1617) in his book "Tabulae Primi Mobilis, quas Directionem Vulgo Dicunt".
Koster has also described a further serious shortcoming of the Placidus system which he terms the 'Placidus Foldover.
For much of the 20th Century the only available book of house division was the Dalton's Tables of Houses, which supposedly used the Placidus system, so this became the only method of house division with which most astrologers were familiar.
* The Tables of Houses, using the Placidus system, are of marginal use in timecycle research. It is better actually to have a complete book of Tables of Houses.
are existing to a number of so-called house systems. E. g. the AFA Tables of Houses for instance, for the Placidus system.
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The Ascendant ...
An astrology chart divides a circle into 12 parts, or Houses. There are many systems of house division. ArtCharts uses the Placidus system, which is *industry standard*. Houses describe where experiences occur.
There are several different house systems that astrologers use, the Equal House system is perhaps the oldest and simplest in that each House is allocated a 30 degree segment within the zodiac circle, other systems, such as the Placidus system are ...
Attempted to purge astrology of "medievalisms" and was perhaps the single greatest cause of the loss of medieval teachings in practice, and was also the one most responsible for introducing the Placidus system into English astrology.
Published volumes containing Tables of Houses for all Latitudes are available, most of them, however, confined to the Placidus system, which is the one most generally used.
Though Koch did not himself develop his system (it was invented by Fiedrich Zanzinger and Heinz Specht), he advocated it and held that it was an improvement on the popular Placidus system, which it resembles.
 See also: House, Planet, Astrology, Houses, Astrologer
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