House Systems at a Glance
1 min read
A house system determines how the twelve houses are divided from the four angles. In the same chart, changing systems may move some planets into different houses. No system is absolutely correct for everyone; using one method consistently to compare events and experience is more reliable than choosing whichever result you like.
Four Systems
| System | Type | Feature | Link |
|---|---|---|---|
| Placidus | Quadrant | Divides by time; the default in many chart tools | House systems compared |
| Equal House | Equal division | Starts at the Ascendant degree and gives each house 30° | House systems compared |
| Whole Sign | Sign-based | One complete sign per house; common in classical astrology | House systems compared |
| Porphyry | Quadrant | Divides each quadrant into three equal parts; a classical quadrant system | House systems compared |
Learning Guides
- Article: Comparing house systems
- Course: Astronomy and house division
- How to choose: Understand the calculation and the tradition behind a system, then use it consistently as you build interpretive experience.
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