Porphyry Houses. An old house system based on division of the ecliptic or dividing the houses by trisecting the semi-arc of the Ascendant/Midheaven. Named for the 4th century Greek philosopher. Also called porphyrian houses.
The Neo-Porphyry system of house division is similar to Porphyry houses except that instead of each quadrant being divided into three equal sized houses, ...
 See also: Fixed star, Western Astrology, Triplicities, Symbol, Placidus Houses
  
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