At a glance
- Identification point
- Specify the house system before comparing assignments.
Definition and identification
Houses relate a local sky framework to twelve interpretive topics. The ascendant lies where the ecliptic meets the eastern horizon, and the midheaven relates to the local meridian. Unlike signs, houses depend on place as well as time. The first house therefore cannot simply be identified with Aries.
Structure and reading rules
Whole-sign houses take the rising sign as the entire first house. Equal houses begin at the ascendant degree and use thirty-degree intervals. Quadrant systems such as Placidus use other divisions of time or space. A chart should state its house system, location, time source and daylight-saving treatment so its construction can be reproduced.
Concrete example
With an ascendant at fifteen degrees Taurus, whole-sign houses assign all Taurus to the first and all Gemini to the second. Equal houses instead start those houses at fifteen degrees Taurus and fifteen degrees Gemini. A point at ten degrees Gemini consequently changes house assignment. The example demonstrates different boundaries rather than a changed personal reality.
Historical context and limits
Ancient terminology and topic assignments do not always match modern practice, and Ptolemy does not represent every classical house tradition. Some quadrant methods encounter computational difficulties at extreme latitudes; software handling should be disclosed. House topics can organize historical study or reflection, while conclusions about family or work require ordinary real-world information.
References & further reading
Historical sources document ideas and rules of their time, not empirical proof of predictive accuracy. Source notes identify the nature and scope of each reference.
- Ptolemy, Tetrabiblos, Book IIIPrimary / tradition source
Ancient natal astrology; editorial notes identify the limited treatment of houses.
- Sepharial, Astrology: How to Make and Read Your Own Horoscope (1920)Primary / tradition source
Modern practitioner manual for chart construction and timing; its scientific and health claims are not endorsed.