This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
John Addey was an astrologer who devised harmonic astrology himself, a technique for analyzing planetary aspects mathematically, and this 1976 book is his own primary presentation of that method, documenting the tradition's own account of the technique and its claimed validity rather than any independent outside test of it.
That primary, self authored source matters for a musical note entry because harmonic astrology's own mathematical language, ratios and divisions of a circle, echoes the older musica universalis intuition that number itself governs both music and the heavens, giving a modern, clearly dated example of that ancient idea being given fresh technical form by a named individual rather than inherited unchanged.
A musical note entry therefore records, where relevant, this documented modern instance of the old correspondence idea being reworked, citing Addey's own book for what his method actually claims and how it is calculated, in the words of the person who created it, honestly distinct from any claim that the method has been independently verified to work. Addey's own book also documents the specific mathematical harmonics, dividing a chart's circle into equal fractions, that his method uses to locate a planetary emphasis, a documented technical detail distinguishing his approach from the older, simpler aspect systems it built on.