How Did Kepler Discover the Sun's Position in Planetary Orbits?

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SUMMARY

Kepler discovered the sun's position in planetary orbits by analyzing the extensive observational data collected by Tycho Brahe. Through decades of meticulous study and experimentation, Kepler formulated his three laws of planetary motion, ultimately concluding that the sun occupies one of the foci of the elliptical orbits. This conclusion was reached after extensive trial and error, demonstrating Kepler's dedication to understanding celestial mechanics.

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  • Understanding of Kepler's three laws of planetary motion
  • Familiarity with elliptical geometry
  • Knowledge of Tycho Brahe's astronomical observations
  • Basic principles of celestial mechanics
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stonecoldgen
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I know that kepler looked at Tacho Bradhe's work and knew the equations related to ellipses

but the question is as simple as:

how did kepler knew the sun was at one of the foci of the ellipse?
 
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Kepler worked for decades studying the observations of Tycho Brahe, trying to come up with a set of rules that would describe the observations. After trying a huge number of things, he was able to distill it down to his three laws. I imagine he arrived at an ellipse with the sun at one focus through simple trial and error.
 

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