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Trigonometry for astrologers
Fundamentals of Trigonometry for Practicing Astrologers

Spherical Geometry Alexey Borealis

These basic formulas are needed to understand the subsequent calculations of the primary directorates. Read it if you use this method.

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House Cusps in Regiomontanus System
House Cusps in Regiomontanus System

House Systems Alexey Borealis

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

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Regiomontanus System
Regiomontanus System Explained

House Systems Alexey Borealis

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

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Placidus House System
Placidus House System Explained

House Systems Alexey Borealis

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.

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Ecliptic, Equatorial, and Horizontal Coordinates
What are the Ecliptic, Equatorial, and Horizontal Coordinates?

Spherical Geometry Alexey Borealis

Acquaintance with the primary directions begins with an understanding of the basics of celestial geometry. Learn the basic concepts of 3D astrology.

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