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

Mathematics of the Celestial Sphere Primary Direction Calculation Mark Rusborn

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

Read more →Mathematics of the Celestial Sphere Primary Direction Calculation Mark Rusborn

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.

Read more →Mathematics of the Celestial Sphere Primary Direction Calculation Mark Rusborn

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.

Read more →Mathematics of the Celestial Sphere Primary Direction Calculation Mark Rusborn

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

Read more →Mathematics of the Celestial Sphere Primary Direction Calculation Mark Rusborn

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

Read more →Mathematics of the Celestial Sphere House Systems Mark Rusborn

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

Read more →Mathematics of the Celestial Sphere House Systems Mark Rusborn

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

Read more →Mathematics of the Celestial Sphere House Systems Mark Rusborn

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.

Read more →Mathematics of the Celestial Sphere House Systems Mark Rusborn

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

Read more →Mathematics of the Celestial Sphere Spherical Geometry Mark Rusborn

In calculating primary directions, it is necessary to know how the right ascension and declination of any degree of any zodiac sign are related.

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