Whose observations did Kepler use to prove that planets do in fact orbit in ellipses ?? Was it Tycho's observations?
You really have to hand it to those early astronomers. Everything was measured using the naked eye and some very crude instruments. No Go-To telescopes available in those days. I guess the only thing on their side would have been No Light Pollution. (Put that candle out!!)Tycho's observations
The word "crude" was comparative and not intended to offend anyone. I wouldn't mind betting that Keppler himself would have used the word if he could see what we use now.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.