Harmonic Astrology (John Addey)

Harmonic astrology was developed by the British astrologer and researcher John Addey (1931–2016), who set forth its principles in the book "Harmonics in Astrology" (1976).

Source of the idea. Draws on numerical mysticism and musical theory (the concept of harmonics as overtones), transposed into astrology.

The principle. If the 360-degree zodiacal circle is divided into N equal parts, the result is an Nth-order harmonic. Each harmonic produces its own chart, revealing aspects and configurations invisible in the natal chart.

How It Works

Example with the 4th harmonic. In the 4th harmonic (H4), all planetary longitudes are multiplied by 4, and the remainder after division by 360 degrees is taken. This produces a new chart showing the "4th level" — the sphere of structure, stability, and physical reality.

What Each Harmonic Reveals

• The 5th harmonic — creativity and joy
• The 7th — spirituality and intuition
• The 9th — wisdom and subtle ideals
• The 12th — limitations and hidden fears

Minor aspects acquire significance. Conjunctions in harmonic charts, corresponding to minor aspects (quintile, septile, etc.) in the natal chart, acquire significance.

Harmonic Diagrams

Multiple levels at once. Addey developed "harmonic diagrams" — methods of graphic representation that allow patterns across multiple harmonics to be seen simultaneously.

Attention from researchers. The method attracted the attention of mathematically oriented astrologers and researchers, though it remained on the periphery of mainstream astrological practice due to the complexity of its calculations and interpretation.

Place in Errarium

The most mathematically formalized. In Errarium, harmonic astrology (#44) is the most mathematically formalized astrological system on the platform.

Analog — cosmobiology. Its closest analogue is Ebertin's cosmobiology (#42) as another rationalist approach to astrology.

The fundamental difference.

• Ebertin — works with midpoints within the space of a single chart
• Addey — works with the mathematical transformation of the entire chart into several parallel "dimensions"