Ptolemy’s Digression: Astrology’s Aspects and Musical Intervals

Explores a half-hidden musical rationale for the conventional ancient astrological aspects that appears in Ptolemy’s Tetrabiblos I.  The number relationships between the aspects do not follow arithmetical patterns so much as the diatonic scale, showing how planets can come into contact based upon their distances from one another. This article appeared in Culture and Cosmos, 2008.

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