- #1
Erenjaeger
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Whose observations did Kepler use to prove that planets do in fact orbit in ellipses ?? Was it Tycho's observations?
Thanks.
Thanks.
Kepler's Laws of planetary motion
- Context: High School
- Thread starter Erenjaeger
- Start date
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Discussion Overview
The discussion centers around Kepler's laws of planetary motion, specifically focusing on the observations made by Tycho Brahe that Kepler utilized to formulate his theories. The conversation touches on the historical context of astronomical measurements and the instruments used during Kepler's time.
Discussion Character
- Historical
- Conceptual clarification
- Debate/contested
Main Points Raised
- Some participants assert that Kepler used Tycho's observations to prove that planets orbit in ellipses.
- One participant expresses admiration for the early astronomers, noting the challenges they faced with limited technology and light pollution.
- Another participant challenges the characterization of Tycho's instruments as "crude," highlighting the Great Equatorial Armillary's size and accuracy.
- Further discussion emphasizes that while modern instruments are superior, Tycho's equipment was impressive for its time, and the term "crude" was meant comparatively.
- Concerns are raised about the accuracy of timekeeping and baseline measurements during Tycho's era, suggesting that these factors could affect the precision of the observations.
Areas of Agreement / Disagreement
Participants generally agree that Tycho's observations were significant for Kepler's work, but there is disagreement regarding the characterization of Tycho's instruments and the implications of their accuracy.
Contextual Notes
Limitations include potential biases in describing historical instruments and the accuracy of measurements, which may depend on various factors not fully explored in the discussion.
- #2
russ_watters
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- #3
sophiecentaur
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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!)Erenjaeger said:
Respect.
- #4
phyzguy
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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.
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sophiecentaur
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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.phyzguy said:
One minute of arc is, in some respects, a barn door. The accuracy of clocks (time is as important as angle) was not good and I would reckon that accuracy of measuring long baselines would also not be very special.
No.They did a great job with what they had to hand.
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