Tag Archives: Philosophiæ Naturalis Principia Mathematica

today’s birthday: Johannes Kepler (1571)

Johannes Kepler (1571)

Described by famed astronomer Carl Sagan as “the first astrophysicist and the last scientific astrologer,” Johannes Kepler was a German astronomer, mathematician, and astrologer. A key figure in the scientific revolution, Kepler derived three famous laws of planetary motion, which, among other things, established that the planets travel around the Sun in elliptical rather than circular orbits. When Kepler was six, his mother, who was later tried for witchcraft, took him to see what phenomenon? More… Discuss


this day in the yesteryear: Philosophiae Naturalis Principia Mathematica Published (1687)


A page from the 1726 edition of the Principia.
A page from the 1726 edition of the Principia. (Photo credit: Wikipedia)

Philosophiae Naturalis Principia Mathematica Published (1687)

Newton’s Principia represents one of the greatest milestones in the history of science and marked the beginning of the modern period of mechanics and astronomy. The text includes Newton’s three famous laws of motion, treatises on dynamics and fluid motion, the unification of terrestrial and celestial mechanics under the principle of gravitation, and an explanation of Kepler’s laws of planetary motion. Principia grew out of Newton’s correspondence with what famous astronomer? More… Discuss

Title page of 'Principia', first edition (1687).

Title page of ‘Principia’, first edition (1687). (Photo credit: Wikipedia)