The cusps of houses in the Placidus system cannot be calculated analytically. Moreover, numerical methods do not work at extreme latitudes either.
The house cusp in the Regiomontanus system is the intersection of the major circle of position with the zodiacal plane. Here are the formulas.
The celestial sphere is unevenly divided into parts by S-shaped curves in this system. Learn what it looks like and where the house cusps come from.
Morinus considered this system the most accurate prediction system, and we agree. Find out what the Regiomontanus house system looks like in space
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