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

Primary Direction Calculation Alexey Borealis

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

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

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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.

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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.

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

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

Read more →Spherical Geometry Alexey Borealis

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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The basis of any horoscope is the Ascendant and Midheaven degrees. In this article, we will derive the formulas for calculating these degrees.

Read more →Spherical Geometry Alexey Borealis

We use the so-called sidereal time expressed in degrees when calculating primary directions. What are sidereal time and its connection with degrees?

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Categories

- Astrology Basics
- Horary Astrology
- Mathematics of the Celestial Sphere
- Natal Astrology