Astronomy 111 – Lecture 7 Harmony of the Spheres



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Astronomy 111 – Lecture 7

Harmony of the Spheres

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Greek Efforts to decipher the Sky

The Rise of the Geocentric System

  • Anaximander of Miletus (610-c.546 BC)

  • Among the first Greek philosophers to suggest a geocentric system:

  • Earth was a flat disk and unmoving.

  • Sun, Moon & Stars were affixed to rotating crystalline spheres centered on the Earth.

  • Sun, Moon & Stars were physical objects.

  • Interesting mix of old (flat earth) and new ideas

The Rise of the Geocentric System

geometric shapes.

  • Pythagorean Model:

  • Spherical Earth fixed at the center

  • Planets & Stars on concentric crystalline spheres

  • Sizes were ratios of small numbers (e.g., 2:1, 3:2)

  • Vibrations from their rubbing together created a harmonious "Music of the Spheres.



The Rise of the Geocentric System

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