Jakob Bernoulli worked on the foundation of probability theory, analytic geometry, and the calculus of variations at the University of Basel. He also studied the catenary, the curve formed by a free hanging rope; the logarithmic spiral; and the cycloid, the path of a point on a turning circle.
He reformed the technique of observing planets as the planetary tables used were very defective. Previous astronomers had performed observations only when planets occupied critical points in their orbits.
Brahe began to observe the planets systematically, night after night. His assistant, Johannes Kepler, later used Brahe's accumulated observations to improve the Copernican system, which Brahe himself had rejected.
After Columbus made his voyages to America Cabot looked for a shorter route to the Spice Islands of the East Indies. He planned to take a route north of the one Columbus followed. In 1497 he reached the North American continent sailing down the east coast from Nova Scotia or Newfoundland.
His voyage prepared the way for the founding of the English colonies in America.
www link :