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Spherical Geometry Mark Rusborn

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

Spherical Geometry Mark Rusborn

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

Horary Basics Mark Rusborn

A horary chart may not contain an answer to the question asked, or contain an answer to something that was not asked. This is a property of radicality

Horary Basics Mark Rusborn

Often astrologers choose the wrong planets to focus on, leading to prediction errors. Learn how to avoid these mistakes in this article.

Spherical Geometry Mark Rusborn

An essential concept in primary directions is the ascension difference. Learn how to calculate this value. This article is for prof. astrologers.

Horary Basics Mark Rusborn

Often astrologers don't separate the context from the subject in a horary question. Moreover, they do not even know what it is. Let's illustrate it.

Spherical Geometry Mark Rusborn

Astrologers must convert zodiacal coordinates to ecliptic coordinates and vice versa when calculating primary directions. Let's derive these formulas.

Horary Basics Mark Rusborn

Astrologers often look at a chart intuitively - first casting it, then searching for what to focus on. But in reality, it should be the opposite.

Spherical Geometry Mark Rusborn

Spherical triangle equations are the foundation of mathematical work for an astrologer-forecaster. We will derive these functional equations here.

Spherical Geometry Mark Rusborn

These equations express the coordinates of the planet in various spherical coordinates and provide a basis for calculating primary directions.