Skip to content
No results
  • Home
  • The Author
  • Contact
  • Papers
  • Literature
    • People
    • Critique
    • House systems
  • Library
  • Visual Astronomy
  • Simulations

Physical Address

The Woodlands, TX, USA

Caelum Stratagem
  • Home
  • The Author
  • Contact
  • Papers
  • Literature
    • People
    • Critique
    • House systems
  • Library
  • Visual Astronomy
  • Simulations
Caelum Stratagem

Lilly’s Geometric Handcuffs: The True Reason the Master Astrologer Could Not Choose Placidus [Ptolemy]

This article was originally published by The Urania Trust One of the…

Learn moreLilly’s Geometric Handcuffs: The True Reason the Master Astrologer Could Not Choose Placidus [Ptolemy]
  • David E. Bustamante
  • June 19, 2026

Las esposas geométricas de Lilly: La verdadera razón por la cual el gran astrólogo no pudo elegir Plácido [Ptolomeo]

La versión original (inglés) de este paper se halla publicada por The…

Learn moreLas esposas geométricas de Lilly: La verdadera razón por la cual el gran astrólogo no pudo elegir Plácido [Ptolomeo]
  • David E. Bustamante
  • June 19, 2026

Morris Kline, Placidus, and the Lost Kinematics of Celestial Partitioning. A Pedagogical Critique of Applied Mathematics

To my dear son, Mateo A prevailing deficiency in modern mathematical pedagogy…

Learn moreMorris Kline, Placidus, and the Lost Kinematics of Celestial Partitioning. A Pedagogical Critique of Applied Mathematics
  • David E. Bustamante
  • June 10, 2026

Morris Kline, Plácido y la cinemática perdida de la partición celeste. Una crítica pedagógica de las matemáticas aplicadas

A mi querido hijo, Mateo Una deficiencia prevalente en la pedagogía matemática…

Learn moreMorris Kline, Plácido y la cinemática perdida de la partición celeste. Una crítica pedagógica de las matemáticas aplicadas
  • David E. Bustamante
  • June 10, 2026

Michael Wackford: “Casas topocéntricas: cabos sueltos y paralelismos poco convincentes”

© Michael Wackford Traducción al español de David Bustamante Segovia El siguiente…

Learn moreMichael Wackford: “Casas topocéntricas: cabos sueltos y paralelismos poco convincentes”
  • David E. Bustamante
  • June 10, 2026

The Phantom Cone: An Algebraic Maze Built to Hide a Natural Clock

Acknowledgments. Before commencing, we must extend our profound gratitude to Philip Graves,…

Learn moreThe Phantom Cone: An Algebraic Maze Built to Hide a Natural Clock
  • David E. Bustamante
  • June 9, 2026
1 2 3 4 … 7
Next

Live Search

No results

Posts

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

Categories

  • Critique
  • House systems
  • People
  • Primary Directions

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

Max Planck (1858-1947)

Trending now

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

Popular Posts

Lilly’s Geometric Handcuffs: The True Reason the Master Astrologer Could Not Choose Placidus [Ptolemy]

June 19, 2026

Las esposas geométricas de Lilly: La verdadera razón por la cual el gran astrólogo no pudo elegir Plácido [Ptolomeo]

June 19, 2026

Morris Kline, Placidus, and the Lost Kinematics of Celestial Partitioning. A Pedagogical Critique of Applied Mathematics

June 10, 2026
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.

About Us

  • Purpose
  • Visual Astronomy

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.

Copyright © 2025 David E. Bustamante