My father, a mercenary soldier, died when I was five years old and I spent my childhood living and working in my grandfather’s inn.
At my second wedding, I was intrigued by the way the volume of the wine barrels was determined, and my interest resulted in a study of the volumes of solids of revolution.
As an astronomer, I had to do intense calculations to come up with astronomical tables – my calculations for the orbit of Mars alone take up nearly a thousand folio sheets of arithmetic.
I developed a new design for the telescope using two convex lenses that was so successful it no longer bears my name but is simply called the astronomical telescope.
Today, I am chiefly remembered for discovering the three laws of planetary motion.
Johannes Kepler (1571-1630)