The Equal House System: Astrology 101

The Equal House system is one of the simplest and most straightforward methods used in astrology to divide the celestial sphere into twelve houses. Unlike systems that use complex calculations based on the ascendant's exact degree or the midheaven, the Equal House system divides the ecliptic into twelve equal parts, starting from the degree of the ascendant. This article explores the Equal House system, detailing its methodology, benefits, and practical uses in astrology.

What is the Equal House System?

The Equal House system assigns each house exactly 30 degrees of the ecliptic, beginning from the ascendant. This method provides a uniform approach to house division, ensuring that each house is of equal size and influence. It is known for its simplicity and effectiveness, particularly in situations where birth times are unknown or uncertain.

Key Features of the Equal House System

  • Uniform Division: Each of the twelve houses covers exactly 30 degrees of the zodiac.

  • Starting Point: The first house begins at the ascendant and subsequent houses follow in zodiacal order.

  • Geographical Independence: The system’s calculations do not vary with geographical location, making it universally applicable.

How Does the Equal House System Work?

Understanding the operation of the Equal House system involves recognizing its straightforward division method:

  1. Ascendant as the First House Cusp: The degree of the ascendant marks the beginning of the first house.

  2. Sequential Houses: Each subsequent house cusp is placed 30 degrees apart from the last, continuing around the zodiac.

  3. No Consideration for the Midheaven: Unlike systems like Placidus or Koch, the Equal House system does not align the tenth house cusp with the midheaven, which can sometimes lead to differing interpretations of career and public status.

Historical Context and Development

The Equal House system is one of the oldest methods of house division, with its origins tracing back to the early practices of Hellenistic astrology. It has been used throughout various cultures and historical periods, favoured for its simplicity and ease of calculation.

Why Use the Equal House System?


  • Simplicity: Ideal for beginners and those who prefer straightforward calculations without the need for advanced astrological software.

  • Clarity in Interpretation: Provides clear demarcations for house influences, making it easier to interpret planetary placements.

  • Useful in Uncertain Birth Times: Effective in situations where the exact time of birth is unknown, allowing astrologers to still cast a meaningful chart.


  • Lacks Fine Detail: May not provide the nuanced interpretations offered by systems that incorporate the exact angles of the ascendant and midheaven.

  • Potential Overgeneralization: By treating all houses equally, the system might overlook specific nuances that other systems capture through unequal house sizes.

Practical Applications

The Equal House system is used widely in natal astrology, particularly for instructional purposes or initial chart analyses. It is also useful in horary astrology, where precise timing may not always be available, and in general astrological studies to provide a baseline for house influences.

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Occultish provides Natal Charts and Horscopes using Equal House System


The Equal House system offers a pragmatic and straightforward approach to astrological house division. Its simplicity and clarity make it a valuable tool for both novice astrologers and seasoned practitioners seeking a clear framework for astrological analysis. Whether exploring astrology for personal insight or professional practice, the Equal House system provides a solid foundation for understanding the celestial influences that shape our lives.

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