Hegel and the Seven Planets

  title={Hegel and the Seven Planets},
  author={E. Craig and M. Hoskin},
  journal={Journal for the History of Astronomy},
  pages={208 - 210}
In the Copernican system, Earth-based observers were able to derive the radii of the planetary orbits in terms of the (mean) Earth-Sun distance, from observation and elementary trigonometry. Before the end of the sixteenth century, Kepler had been struck by the disproportionate gap between the orbits of the fourth planet, Mars, and the fifth, Jupiter, and had considered the possibility of filling the gap with a planet hitherto unobserved.' Although Kepler eventually found an alternative way of… Expand
9 Citations


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For a modern account of this well-known episode, see for example the entry on Piazzi in Dictionary of scieniific biography
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