# Category "Mathematics of the Celestial Sphere" Page 1/2

BlogAdvanced Astrology ❘ Mathematics of the Celestial Sphere ❘ Primary Direction in Placidus System

A complete guide for astrologers: calculating a primary direction in the Placidus house system with mathematical formulas. Primary Direction in Regiomontanus System

A complete guide for astrologers on how to calculate a primary direction in the Regiomontanus house system with math formulas. Mundane Antiscia Equation

Antiscia is a point symmetrical to the planet's degree. But if the planet deviates from the ecliptic, it has two antisсia. Let's illustrate it. A Circle of Mundane Aspects

The main question in primary directions is which plane to use for aspects. It is not the equator or the ecliptic. Let's explore the right approach. Mundane Position in the Regiomontanus System

Planets conjunct each other spatially when their mundane positions coincide. What is it, and how can it be calculated? Learn more from this article. Mundane Position in the Placidus System

What does the spatial connection of two planets look like in the Placidus house system? Get acquainted with the equations of mundane positions. House Cusps in Placidus System

The cusps of houses in the Placidus system cannot be calculated analytically. Moreover, numerical methods do not work at extreme latitudes either. House Cusps in Regiomontanus System

The house cusp in the Regiomontanus system is the intersection of the major circle of position with the zodiacal plane. Here are the formulas. Placidus House System Explained

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. Regiomontanus System Explained

Morinus considered this system the most accurate prediction system, and we agree. Find out what the Regiomontanus house system looks like in space