Astronomy]. Kepler, J. Welt-Harmonik. German transl. and introd. M. Caspar. Munich/ Berlin, R. Oldenbourg, 403p., ills., orig. gilt cl., large 4to. = According to the preface the first complete German translation of Harmonices Mundi, on the (physical) harmonies in the cosmos (i.e. our planetary system), in which Kepler first published his Third Law of planetary motion, on the relationship between the distance of planets from the Sun, and their orbital periods. The planets were long thought to move around each in their own shell or sphere, and each at a different speed: the farther away from the centre (be that the Earth of the Sun, depending on the view on the cosmos), the slower. There were certain numerical intervals between those different speeds, just like there are intervals in music. These harmonies were called the 'music of the spheres'. Johannes Kepler discovered that the planets themselves did not move at constant speeds, causing the corresponding musical tones to vary, thus creating whole melodies. Kepler describes these findings in his Harmonices Mundi, accompanied even by musical scores. Call for price
Astronomy]. Kepler, J. Welt-Harmonik. German transl. and introd. M. Caspar. Munich/ Berlin, R. Oldenbourg, 403p., ills., orig. gilt cl., large 4to. = According to the preface the first complete German translation of Harmonices Mundi, on the (physical) harmonies in the cosmos (i.e. our planetary system), in which Kepler first published his Third Law of planetary motion, on the relationship between the distance of planets from the Sun, and their orbital periods. The planets were long thought to move around each in their own shell or sphere, and each at a different speed: the farther away from the centre (be that the Earth of the Sun, depending on the view on the cosmos), the slower. There were certain numerical intervals between those different speeds, just like there are intervals in music. These harmonies were called the 'music of the spheres'. Johannes Kepler discovered that the planets themselves did not move at constant speeds, causing the corresponding musical tones to vary, thus creating whole melodies. Kepler describes these findings in his Harmonices Mundi, accompanied even by musical scores. Call for price
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