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Astronomy and Cosmology
Astronomy and Astrophysics
Kepler's Laws of planetary motion
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[QUOTE="phyzguy, post: 5492501, member: 237160"] I don't think I would use the word "crude" to describe Tycho's Great Equatorial Armillary that he used to gather the observations that Kepler used. See the attached drawing. It was 3 meters in diameter and accurate to approximately 1 minute of arc. Of course we can do much better today, but for the time it was a very well designed and impressive instrument. [/QUOTE]
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Astronomy and Astrophysics
Kepler's Laws of planetary motion
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