Jerome Lalande (born July 11, 1732, Bourg-en-Bresse, France—died April 4, 1807, Paris), French astronomer whose tables of planetary positions were considered the best available until the end of the 18th century.
His name is one of the 72 names inscribed on the Eiffel Tower.
The crater Lalande on the Moon is named after him.
1781
1765
VY Canis Majoris (abbreviated to VY CMa) is an extreme oxygen-rich (O-rich) red hypergiant (RHG) or red supergiant (RSG) and pulsating variable star 1.2 kiloparsecs (3,900 light-years) from the Solar System in the slightly southern constellation of Canis Major. It is one of the largest known stars, one of the most luminous and massive red supergiants, and one of the most luminous stars in the Milky Way.
1801
The Davisson–Germer experiment was a 1923-1927 experiment by Clinton Davisson and Lester Germer at Western Electric (later Bell Labs),[1] in which electrons, scattered by the surface of a crystal of nickel metal, displayed a diffraction pattern. This confirmed the hypothesis, advanced by Louis de Broglie in 1924, of wave-particle duality, and was an experimental milestone in the creation of quantum mechanics.