Musica universalis
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The musica universalis, also called music of the spheres or harmony of the spheres, is a philosophical concept that regards proportions in the movements of celestial bodies—the Sun, Moon, and planets—
Harmony of the World from Ebenezer Sibly's Astrology (1806)
Renaissance engraving (Gafurius's Practica musice, 1496) showing Apollo, the Muses, the planetary spheres and musical modes
Page from Kepler's Harmonices Mundi. The scales of each of the six known planets, and the moon, placed on five-line staffs.
Quadrivium
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The quadrivium is a pedogogical grouping of four historical mathematical arts—arithmetic, geometry, music, and astronomy— which was first taught in classical antiquity, and later revived in medieval E
Musica universalis
…that both reflect the beauty of God. Musica universalis—which had existed as a metaphysical concept since the time of the Greeks—was often taught in quadrivium, and this intriguing connection between music and astronomy stimulated the imagination of Johannes Kepler as he devoted much of his time after publishing…
For most medieval scholars, who believed that God created the universe according to geometric and harmonic principles, science—particularly geometry and astronomy—was linked directly to the divine. To seek these principles, therefore, would be to seek God.
Woman Teaching How to Construct Geometric Shapes. Illustration at the beginning of a medieval translation of Euclid's Elements (c. 1310)