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

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

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.

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.

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

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

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

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

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

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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