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The Placidus system of houses, also formerly known as the Ptolemaic Method, is a system that can be described as "Time-proportional House System of Movement". This is in contrast to the space-based systems that are built on astronomical great circles, rather than on time curves.
Placidus de Titis (also de Titus, Latinization of Placido de Titi, pseudonym Didacus Prittus Pelusiensis; 1603–1668) was an Olivetan monk and professor of mathematics, physics and astronomy at the University of Pavia from 1657 until his death.
While we typically trace the origins of Placidus houses to their namesake, the Olivetan monk Placidus de Titis who lived between 1603 to 1668, we can actually see earlier references to Placidus houses in the works of Abraham ibn Ezra who was active in the 12th century.
The Placidus house system is named after the Italian monk and mathematician Placidus de Titis (1603-1668), but was invented by the astronomer and mathematician Giovanni Antonio Magini (1555-1617). More information can be found in the Astro Wiki
The Placidus House System is a system of house division that utilizes the movement over time on the ecliptic, or the sun’s apparent path through the sky. Each degree of the zodiac has a diurnal arc, i.e. , how far it moves in a day.
Placidus is the most widely used house system in modern Western astrology. To determine the cusps of houses 2, 3, 11, and 12, the paths drawn from each degree of the ecliptic to the Imum Coeli (IC), then from the horizon (DS) to the Midheaven (MC), are divided into three parts.
The Placidus house system divides a birth chart into twelve houses, each representing specific life areas. It was created by Italian mathematician and astronomer Placidus de Titis in the 17th century. The Placidus system considers the curvature of the Earth when dividing houses.
