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Caelum Stratagem
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Caelum Stratagem

Trisection of ascensional times: Fundamental differences in Ptolemy (Placidus), Alcabitius, and Koch

A prevalent confusion exists in expert astrological literature (e.g. Rootjes, Carter, Evans,…

Learn moreTrisection of ascensional times: Fundamental differences in Ptolemy (Placidus), Alcabitius, and Koch
  • David E. Bustamante
  • December 10, 2025

Trisección del tiempo de ascensión: diferencias fundamentales entre Placidus, Alcabitius y Koch

Existe una confusión común en la literatura astrológica experta (e.g. Rootjes, Carter,…

Learn moreTrisección del tiempo de ascensión: diferencias fundamentales entre Placidus, Alcabitius y Koch
  • David E. Bustamante
  • December 10, 2025

A plea for Placidus [Commentary on a recent methodological discovery]

The problem of horizon division has fascinated me ever since I started…

Learn moreA plea for Placidus [Commentary on a recent methodological discovery]
  • Jan Kampherbeek
  • January 28, 2020

A favor de Placidus [Comentario sobre un descubrimiento metodológico reciente]

El problema de división de casas siempre me ha fascinado desde que…

Learn moreA favor de Placidus [Comentario sobre un descubrimiento metodológico reciente]
  • Jan Kampherbeek
  • January 28, 2020
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Translator’s Preface to Brennan’s ‘Hellenistic Astrology’: A Study in Technical Transposition

March 17, 2026

Declaration of Research Methodology: The Primacy of Forensic Geometry

February 10, 2026

Las direcciones primarias y el requisito temporal natural ineludible del tiempo de llegada

December 15, 2025

The Primary Directions and the Ineluctable Natural Temporal Requisite of the Time of Arrival

December 15, 2025

Trisección del tiempo de ascensión: diferencias fundamentales entre Placidus, Alcabitius y Koch

December 10, 2025

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Shun much more the reproach of having suppressed strong opinions than that of having been too gentle in evaluating them

Max Planck (1858-1947)

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Translator’s Preface to Brennan’s ‘Hellenistic Astrology’: A Study in Technical Transposition
Declaration of Research Methodology: The Primacy of Forensic Geometry
Las direcciones primarias y el requisito temporal natural ineludible del tiempo de llegada
Trisección del tiempo de ascensión: diferencias fundamentales entre Placidus, Alcabitius y Koch

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Translator’s Preface to Brennan’s ‘Hellenistic Astrology’: A Study in Technical Transposition

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Interesting fact

The translator of Ptolemy’s Tetrabiblos, F.E. Robbins (1940, Loeb Classical Library), provided a description of the Ptolemaic/Placidus method of celestial partition that is notably more precise than those offered by subsequent commentators, including figures such as Colin Evans, Charles E.O. Carter, and Ralph W. Holden. For the specific details on the Ptolemaic/Placidus method, refer to the Tetrabiblos, Book III, Chapter 10, pages 286-288, footnote 3.

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Useful Information

Until the 18th century, the practices of astrology and astronomy remained largely undelineated or indistinguishable. Even though this integration began to dissolve following the scientific revolutions, after the Second Industrial Revolution, the discipline took an unfortunate turn, becoming largely synonymous with the generalised Sun-sign columns found in newspapers and magazines, often termed “Sun-sign astrology.” This popular construct can be more accurately described as a consumer product of contemporary western capitalist societies, rendering the designation “astrology” imprecise for serious discourse. Methodologically, traditional astrology encompasses the foundational and content-rich periods of the Hellenistic era and the Middle Ages, whereas the more sophisticated and/or technical developments of the 16th and 17th centuries (Renaissance) can be categorised as early modern or late traditional astrology. The discipline’s standing deteriorated significantly during the 19th century, period correctly termed contemporary astrology.

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