Johannes Kepler
1571 – 1630
His laws of planetary motion made orbits calculable.
The German astronomer whose three laws of planetary motion, derived from Tycho Brahe's data in the early 1600s, made the solar system calculable and set the stage for Newton's gravitation.
The orbital-period and transfer tools here rest on Kepler's laws — the first time the heavens were reduced to arithmetic a person could check.
Portrait: a stylized blueprint-line rendering, not a photograph.
Contributions in the toolbox
- 1615
Nova stereometria — wine-barrel gauging done with proto-calculus.
→ Horizontal Tank Volume - 1619
Third law: T² ∝ r³.
→ Circular Orbit Velocity & Period