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What are the Sidereal Time and RAMC?
What are the Sidereal Time and RAMC?

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?

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Radicality of the Horary Chart
Radicality of the Horary Chart

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

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Confusion With Significators
Confusion With Significators in Horary Charts

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.

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Ascension Difference Equation
Ascension Difference Equation

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.

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The Horary Question Context
The Horary Question Context

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.

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How to Convert Ecliptical coordinates to Equatorial And Vice Versa?
How to Convert Ecliptical coordinates to Equatorial And Vice Versa?

Spherical Geometry Mark Rusborn

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

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Horary Chart Interpretation
Horary Chart Interpretation

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.

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Spherical Triangles Equations
Spherical Triangles Equations

Spherical Geometry Mark Rusborn

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

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rotation matrices
How to Convert One Spherical Coordinate System to Another?

Spherical Geometry Mark Rusborn

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

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Basic Concepts of Horary Astrology
What is a Horary Astrology

Horary Basics Mark Rusborn

There have been a lot of talks lately about horary astrology. But not all of what has been said is true. What is horary astrology really?

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