PlacidusThe Pacidus house system divides the phases of planetary and star movement above and below the horizon into equal-sized parts. A planet on the cusp of the twelfth house, for example, has already passed 1/6 of its so-called diurnal arc, a planet on the eleventh house cusp 2/6, a planet on the MC 3/6 or half of its diurnal arc, etc. The houses below the horizon divide the so-called 'nocturnal arc' of the stars and planets. So, the Placidus system divides celestial movements and is consequently considered a time-oriented system. For mathematical reasons, Placidus houses cannot be calculated for regions beyond the polar circles. 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 |