Kepler publishes his first two planetary laws
Year only · Date as reported
Kepler described elliptical planetary orbits and the equal-area law using Tycho Brahe’s observations.
- Type
- astronomy publication
- Category
- astronomy theory
- Organization
- Johannes Kepler
- Participants
- Johannes Kepler
Sources and attribution
- NASA Goddard — Historical astronomy timeline (opens in a new tab) — Factual summary; source attribution retained.