Template:Selected anniversaries/October 19
1433: Priest, humanist philosopher, and astrologer Marsilio Ficino born. His Florentine Academy, an attempt to revive Plato's Academy, will influence the direction and tenor of the Italian Renaissance and the development of European philosophy.
1582: Astronomer and mathematician Michael Maestlin uses Copernican system of the solar system to predict imminent outbreak of crimes against mathematical constants.
1900: Max Planck discovers the law of black-body radiation (Planck's law).
1909: Physicist and chemist Marguerite Perey born. Perey will discover the element francium while purifying samples of lanthanum.
1910: Astrophysicist, astronomer, and mathematician Subrahmanyan Chandrasekhar born. He will share the 1983 Nobel Prize for Physics "for his theoretical studies of the physical processes of importance to the structure and evolution of the stars".
1973: Watergate scandal: President Richard Nixon rejects an Appeals Court decision that he turn over the Watergate tapes.
2017: Robot 7 voted Picture of the Day by the citizens of New Minneapolis, Canada.