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Notes, analyses and observations

Working notes, real-chart analyses and observations from research practice — without hasty conclusions or astrology jargon for its own sake.

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

Once it comes to primary directions, we need to observe the circle of aspects that doesn't coincide with the ecliptic.

Equation of the mundane position of a planet from its right ascension and declination in Placidus house system.

What is the mathematical equation for calculating the house cusps in the Placidus house system? For prof. astrologers

What are the correlations between right ascension, declination, and celestial latitude for any point on the ecliptic?

Suppose you know the sidereal time and local coordinates. What is the ascending degree? The math formula for ASC.

What is the right ascension of Medium Coeli, and how is it connected with sidereal time? Astrology knowledge base.

A simple way to calculate ascension difference with use of spherical triangle equation. Astrological knowledge base

What math equations are needed to express zodiacal longitude and latitude to the right ascension and declination?

In this article, we derive math equations for spherical triangles, including the well-known theorem of sinuses.