Johannes Kepler, Galileo Galilei, the slide rule, and John Napier

Essay #22 History Of Inventions Hello, in today’s essay I will be talking about Johannes Kepler, Galileo Galilei, the slide rule, and John Napier. Let’s get started. Johannes Kepler Johannes Kepler was born in 1571 in the holy Roman empire, whose grandfather was a mayor, and his father was a mercenary. His mom took him