Astronomy & Space Science · History of Astronomy
A topic within History of Astronomy, itself one of 8 topics in that field and part of Astronomy & Space Science.
2 works
Johannes Kepler
Uses Tycho Brahe's observations of Mars to argue planets move in ellipses at speeds that sweep out equal areas in equal times, discarding the circular orbits every astronomer before him had assumed.
link checked 17 Sept 2026Johannes Kepler
Argues the planets' orbital periods and distances from the sun are related by a single law, the square of the period proportional to the cube of the distance, discovered within a broader search for cosmic musical harmony.
link failing as of 17 Sept 2026