"It is surprising that Kepler did not consider Jost Bürgi, who from around 1580 to 1592 already constructed planetary globes that were considered awesome works of art. ...In the letter 42 dated May 28th 1598, to the Duke Friederich I von Württemberg (1557–1608), Kepler writes that he will construct a globus with a planetarium. It is possible and likely that the Duke had in mind a sky globus similar to those already constructed by Eberhard Baldewein (1525-1593), Gerhard Emmoser (1556-1584) or Jost Bürgi (1552-1631), but none of these authors were cited in Kepler’s overview. These machines were designed and constructed to show the overall motion of the sky, to identify the position of the stars, to show the motion either of the Sun, the Moon or both."
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Daniele L. R. Marini, "The Planetary Machine Designed by Johannes Kepler" (August 2022) pp. 10 (footnote 30) to 12. Creative Commons 4.0 International License.
https://en.wikiquote.org/wiki/Jost_B%C3%BCrgi
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Jost Bürgi
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