Understanding Astrological House Division at Kepler College

10 AM Pacific / 1 PM Eastern / 6 PM GMT / 7PM Central European

5 April 2025 – Zoom Room (codes TBA)

Have you ever wondered why astrologers can’t agree on a single house system? Why don’t all astrologers use the same house system? What distinguishes one system from another? And why were new house systems developed throughout history?

From ancient times to the modern era, astrologers selected
house division methods based on divergent celestial circles,
believing that each method aligned more closely with the
techniques they practiced. The symbolism inherent in these
celestial circles profoundly influenced their delineations, often
yielding more accurate and meaningful results.

In this talk, attendees will explore the reasoning behind the
major house systems in use today and uncover the deeper
symbolism of the celestial circles that shape house division in
astrology.

Reflection on the First Consideration of Bonatti

I did a contemplation on the First Consideration of Guido Bonatti’s 146 Considerations. Below are my notes of the contemplation.

Guido Bonatti was one of the most famous of medieval astrologers. An advisor to important politicians in 13th Century Italy, his astrological advice influenced key events in his tumultuous times. He was so well known and influential that Dante includes him in the Inferno!

The translation I used was that of Benjamin N. Dykes (Cazimi press 2010). If you don’t have a copy, you can find an online translation by Henry Coley (1675) of the 146 Considerations here.

Reflection on the First Consideration:

In this consideration Bonatti explains how it is we can ask a horary question at a seemingly random time, cast a chart for that time, and that we somehow get an answer from the apparently arbitrary configurations of the planets in relation to the constellation of stars.

Bonatti’s explanation has three components:

He says that the explanation must first come from the querent’s Soul. The querent is “moved by his intention to pose a question”. Essentially, this means that the querent must be emotionally involved with the question, the more pressing the need, the better the answer. Frivolous questions are likely to get a frivolous response, as are questions asked from idle curiosity.

Bonatti goes on to say that the second component is, of course, the planets and constellations themselves and their movement.

He finishes by saying that it is the “stars” themselves that prompt the querent to ask the question. That the question would not have come to the surface of consciousness unless the stars were positioned in such a way that this could happen.

Finally, Bonatti gives us the third component. He says that it isn’t enough to have the original thought or impulse concerning the question, nor will an astrological configuration favorable to answering the question be enough to result in a horary chart. The final ingredient concerns the will of the querent to act on the motivation one receives from within, in combination with the configuration of the various astrological objects in the sky and what they represent.

Yet, Bonatti does not halt his inquiry there. He delves deeper, probing the dialectic between human volition and cosmic configuration. It is not merely the inception of thought nor the fortuitous alignment of astral bodies that precipitates the birth of a horary chart. Rather, it is the fusion of inner impetus with celestial alignment—the harmonious resonance of human will with cosmic intent—that catalyzes the gestation of inquiry. Bonatti unveils the ineffable synthesis of human will and cosmic resonance—a cosmic alchemy wherein the querent’s inner impulse converges with the celestial symphony.

When the motivation of the querent and that of the stars perfectly align, the querent takes action and brings the question to the astrologer. The precise moment that the astrologer understands the question is the moment that the chart is cast.

This moment falls within the realm of fate, which was set in motion by the subtle thought or nudge emanating from the querent’s Soul until gradually taking on form until it is finally engraved upon the querent’s field of consciousness. The universe takes notice and events unfold on the outer in a seemly “natural” way that by the time the querent takes the question to the astrologer and the astrologer has understood the question, the stars have moved into perfect alignment, and the question is answered.  

R. Redmond Chatham – Paris, March 2024.


Upcoming workshop at Astrological Lodge of London

I’m giving a 3-part series of Zoom workshops on house division at the Astrological Lodge of London.

Each workshop is one hour in length, the first is next Monday 25 September at 8:30pm, London time. The subsequent two parts of the workshop are on the following Mondays at the same time, 2 Oct & 9 Oct.

In these workshops, we’ll look at the astronomy behind house division calculation. While there is no math involved, we will look at the celestial circles used in calculating the house cusps and learn to identify them, and then discuss their symbolic implications with respect to chart interpretation.

These workshops do not take a position on a “best” house system. We simply look at the major ones used in ancient, medieval and modern times and consider how they are calculated, we’ll look at their respective differences, and how those differences might affect astrological symbolism.

There is a good deal of information to assimilate and discuss, so rather than try to do it in one go, we’ve split the workshop into three parts:

On 25 September, we’ll do Part 1, where we will look in detail at how the ecliptic based house systems are calculated (WSH, equal and Porphyry), and the symbolic implications of using the ecliptic as the primary celestial circle used in calculating a house system.

Part 2 (held on 2 Oct.) will cover space-based house systems such as Meridian, Regiomontanus and Campanus, and Part 3 (9 Oct.) will cover the time-based systems such as Alcabitius semi-arc, Placidus and Koch.

I’ll post details of how to register for the workshops shortly.

The fees per lecture are as follows:

Lodge Members £8, Concessions £6 – Non-Members £12, Concessions £8.

Astrologer Mary English interviews Rhys.

British astrologer Mary English interviews Rhys for her podcast.

Many astrologers have side gigs that they do in addition to astrology. Some of us are also psychologists, we have some homeopaths, stock analysts, also psychiatrists; I know of at least one astrologer who, when no one is looking, is a lawyer!

Astrologer Mary English outed me in my other line of work in this talk that we had recently on her podcast. Learn the shocking truth here…

In this interview, I speak about my background as an astrologer and stay away from overly technical topics. Mary and I speak about astrology in its broad strokes.

Here is the link to the podcast.

And here is a video version of the podcast:

—ooOoo—

Interview with Rhys by Ana Isabel at LifeAstrologer

Why are there so many astrological house systems and why should they create so much controversy?

In this conversation with Ana Isabel of LifeAstrologer, Rhys Chatham discusses how the various house systems evolved and the different ways in which they have been used.

Rhys Chatham Replay: House Division and Celestial Spheres

The replay link is below for this month’s AFAN Community Workshop with Rhys Chatham on ‘Astrological House Division and the Symbolism of the Celestial Circles.’ Rhys explained how the major house division systems are calculated in a way that does not require any math.

Rather than advocate the use of one house system over another, Rhys compared them and looked at the various celestial circles they are based on. He guided us through the symbolic implications of each of house system and how they might impact your chart interpretation.

In the workshop Rhys taught what distinguishes one house system from another, allowing you to make informed choices on which ones to use, for what, and when.

The house systems covered in the workshop included the ecliptic-based (whole sign, equal and Porphyry), space-based (Meridian, Regiomontanus, Campanus), and time-based houses (Alcabitius, Koch and Placidus).

New Article by Rhys in The Evolving Astrologer.

March Equinox Issue

I have a piece on Astrological House Division in the current issue of The Evolving Astrologer (formerly known as the Career Astrologer). This magazine is published by the Organization for Professional Astrology (OPA). It is directed at all those interested in Astrology, newcomers and professionals alike.

Click here to download a PDF version of the magazine. My article appears on page 48-55.

Rhys gives a Zoom talk at AFAN on Saturday, 1 April

For your ticket and Zoom codes, click here.

Saturday, 1 April at:

  • 10AM EDT (East coast-USA),
  • -3PM (Ireland, UK, Portugal),
  • 4PM (Amsterdam, Berlin, Oslo, Paris, Rome).

Rhys Chatham explains how the major house division systems are calculated in a way that does not require any math.

Rather than advocate the use of one house system over another, we will simply compare them and look at the various celestial circles they are based on, reflecting upon the symbolic implications of each of them and how they might impact on chart interpretation. We’ll discuss what distinguishes one house system from another, allowing you to make informed choices on which ones to use, for what, and when.

In this talk we will cover the ecliptic-based (whole sign, equal and Porphyry), space-based (Meridian, Regiomontanus, Campanus), and time-based houses (Alcabitius, Koch and Placidus).

It’s free! If you would like to attend, click on the site (below) to register and get your ticket and Zoom codes.

House division systems are based on different celestial circles. After a quick review of the astronomy, we’ll discuss those differences and look at how they might affect chart delineation on both symbolic and practical levels.