This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
William Lilly's 1647 astrological textbook pairs each of the four Galenic temperaments with a specific planet, Mars for choleric, Saturn for melancholic, the Moon for phlegmatic and Jupiter for sanguine, giving a documented working example of how a practicing seventeenth century astrologer actually applied the older medical humoral theory to chart reading rather than treating the two systems as separate.
That documented pairing matters for a temperament entry because the specific planetary assignment is not part of Galen's own original medical theory, it is a later addition astrological practice layered onto it, and Lilly's text lets an entry record honestly which part of a temperament's meaning traces to the ancient medical source and which part entered through this later astrological synthesis.
An entry therefore uses Lilly's own textbook for the documented planetary pairing and its stated seasonal and elemental reasoning, fire and summer for choleric, earth and autumn for melancholic, water and winter for phlegmatic, air and spring for sanguine, while keeping the humoral theory's own medical origin sourced to the earlier Galenic material it actually comes from.
An entry states this planetary layer as Lilly's own documented seventeenth century synthesis, never as part of Galen's original medical claim, since keeping the two authorship layers separate is what lets a reader trust either one on its own terms.