What groundbreaking calculation did Johannes Kepler derive from Tycho Brahe's precise positional data?

Answer

Planets move in ellipses with the Sun at one focus

Kepler made the mathematical leap, derived from Brahe's data, that planets move in elliptical paths rather than perfect circles, establishing his three laws of planetary motion.

What groundbreaking calculation did Johannes Kepler derive from Tycho Brahe's precise positional data?

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