Kepler: quantitative laws for planetary orbits

What changed

Used astronomical observations to describe elliptical orbits and equal-area motion, followed by a relation between orbital periods and sizes.

Scientific scope

Used astronomical observations to describe elliptical orbits and equal-area motion, followed by a relation between orbital periods and sizes. Scope limitation: 1609 dates the first two laws; the third appeared in 1619. Tycho Brahe’s observations were a crucial precursor and are identified separately.

Evidence

Assessment uses the catalogue-linked source evidence for the stated contribution. 1609 dates the first two laws; the third appeared in 1619. Tycho Brahe’s observations were a crucial precursor and are identified separately.

Contributors

• Johannes Kepler · SCIENCE: Named source contributor; exact labor shares are not measured.
• Tycho Brahe · SCIENCE: Named source contributor; exact labor shares are not measured.

• Kepler: quantitative laws for planetary orbits — institutional collection or historical source

Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.

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