House Systems
House Systems
Different astrological traditions divide the houses in varying ways. The most common house systems include:
- Placidus – Widely used in modern Western astrology; divides time between ascendant and midheaven.
- Equal House – Each house is exactly 30°, starting from the Ascendant.
- Koch – Similar to Placidus but adjusts for latitude and time of day.
- Whole Sign – The simplest approach: the entire sign that contains the Ascendant becomes the first house, and the next sign becomes the second, and so on.
Choosing a house system often depends on personal preference, philosophical outlook, or the type of astrology practiced. No system is universally “correct.”
Why House Systems Differ
Because Earth is a sphere and tilted on its axis, projecting the sky onto a flat chart involves choices about how to measure space and time. Each system handles these calculations differently, leading to variations in house cusps—especially at higher latitudes.
How to Decide
- Experiment with several systems to see which resonates with your experiences.
- For beginners, Placidus or Whole Sign are popular starting points.
- Remember that interpretation skills matter more than the system itself.
Note:
This file is an original educational summary for the Astrology Arith(m)etic project. It does not reproduce proprietary text.