In episode 313, astrologer Luis Ribeiro joins the show to explain the astronomy and mathematics behind the calculation of different house division patterns in Western astrology.
We begin with a historical timeline showing when some of the different forms of housing subdivisions originated, who mentioned them in the earliest sources, and when they peaked in popularity.
We then move on to a detailed breakdown of the astronomy and mathematics behind how some of the most popular forms of house distribution are calculated.
In particular, we will focus on the rationale for whole-sign houses, equal houses, porphyry houses, Alkabitius, Campanus, Regiomantanus, and Placidus.
Our goal was not to promote any system or to talk about which one is better to use in practice, but to help astrologers understand how wells are divided according to each approach.
At the end of the episode, we have a section where we talk about an astronomical instrument called an astrolabe and show how medieval astrologers used it to calculate the ascendant, midheaven and other intermediate house cusp.
For more information on Luis and his work visit:
This episode is available in both audio and video versions below, but we encourage you to watch the video version as there are a lot of visuals.
Time signs
Here are some timestamps for the topics covered at various points in the episode:
00:00:00 Login
00:01:00 Lewis’ book “On the Celestial Spheres”.
00:01:50 Louis’ research on the astronomical basis of house division
00:04:18 Understanding the basics of home partition systems
00:05:04 Why Astrology Students Should Study Astronomy
00:07:20 Famous astrologers who are astronomers
00:08:40 Requirement to draw diagrams by hand in some schools
00:11:45 Different types of home systems
00:14:30 Ways to divide the house by time
00:17:38 The whole character house system and its loss
00:20:55 Equal home system
00:29:50 Porphyry home system
00:33:57 Alcabitius home system
00:41:03 Works on home separation systems
00:43:40 The whole sign is not considered house splitting by some academics
00:51:25 German book from 1959 recognizing all sign houses
00:54:03 Call house system
00:57:00 Regiomontanus home system
01:05:50 Astro.com Home System Options
01:07:30 Solar fire house system options
01:09:34 Quiet House System
01:14:26 Main or daily movement
01:17:47 Ecliptic
01:22:27 Numbering of houses
01:27:03 Dividing the circle
01:31:43 View of the ecliptic from the astronomy program
01:39:59 Meridian
01:44:50 Example of a square chart
01:46:40 3D diagram of sections
01:50:00 Zenit
01:53:00 Equator
01:54:05 Equator view from astronomy software
01:56:40 View from the north in the astronomy program
01:59:10 Zodiacal belt
02:00:43 2D diagram of sections
02:02:09 Whole character method
02:04:48 Method of equal houses
02:08:12 Porphyry method
02:14:44 Alkabitius method
02:19:20 Call method
02:24:19 Method of Regiomontanus
02:28:32 Way to relax
02:38:39 Length of life technique and house division
02:54:30 Need good documentation for home systems
02:55:45 Bias in academic research
02:57:42 Errors in describing home systems
03:03:33 Different peaks
03:04:36 Astrolabe Basics
03:14:10 Counting houses with astrolabe
03:26:18 Horary astrology and astrolabe
03:29:00 Horoscope
03:32:07 Astrology in academia
03:34:11 The problem of different home systems
03:38:50 Different house systems for horary and natal
03:45:31 Revised version of Luis’s book
03:46:00 Luis’s website and the Astro project
03:46:43 Upcoming episode about Helena’s work and new book
03:47:55 Closing remarks
Watch the video version of this episode
Watch the video version of this episode about house division in astrology:
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Transcription
Here is the full transcript of this episode: Episode 313 Transcript
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