# Visualizing Math

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Harmonices Mundi (Harmony of the World) by Johannes Kepler, 1619

In Harmonices Mundi (1619), Kepler attempted to explain the harmony of the world and contained what is known today as his third law. The work was founded on geometry, from which Kepler derived first a theory of musical harmony and then a cosmology of the heavens and the earth. Kepler attempted to find common rules between music and movement in the solar system. His music of the spheres is based on the relative maximum and minimum angular velocities of the planet measured from the sun. Using his theories, Kepler allotted to the planets musical intervals and musical motion.

The Earth sings Mi, Fa, Mi: you may infer even from the syllables that in this our home misery and famine hold sway" -Kepler.

Johannes Kepler (1571-1630) was a German mathematician, astronomer and astrologer. A key figure in the 17th century scientific revolution, he is best known for his laws of planetary motion based on his works Astronomia nova, Harmonices Mundi, and Epitome of Copernican Astronomy. These works also provided one of the foundations for Isaac Newton’s theory of universal gravitation.

Prints of Harmonices Mundi are available here. Does anyone know what “Hiclocum haber eriam” means?

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