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severákova polívka

asi zelňačka (mainly in czech)

(fork of http://severak.soup.io/)

severak 10.12.2018 14:28:55

Bicycles for the Mind: The Slide Rule

At the turn of the 16th century, Johannes Kepler set out to disprove Copernicus, who believed planets orbited in perfect, concentric circles from the sun. Kepler first formulated his hypothesis: planets had elliptical orbits with two foci, and then set out to prove it mathematically. 4 years and 900 pages