How you derive the boundaries (cusps) between houses is entirely based on whether you calculate on the basis of a space-based system, a time-based system, or a space-time based system.
What’s the difference between Placidus and porphyry? Proponents of the equal house system claim that it is more accurate and less distorting in higher latitudes (especially above 60 degrees) than the Placidean and other quadrant house systems. What is the most accurate house system in astrology? This, divided in two, becomes the point of the meridian or midheaven. Each degree of the zodiac has a diurnal arc, i.e., how far it moves in a day. 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. Koch’s idea that this system of houses was particularly related to the birth place, because the house cusps were all calculated using the polar elevation (= geographic latitude) of the place of birth, whereas Placidus, Regiomontanus and Campanus made use of “fictitious poles” and made the birth take place on all … What is Placidus birth chart? What is the difference between Placidus and Koch?
