This Day in Geek History: December 18
1839
In New York City, John Draper makes a daguerreotype of the Moon, becoming the first person in the U.S. to photograph a celestial body, the Moon.
1926
In a letter published in the journal Nature, American chemist Gilbert Newton Lewis coins the term “photon.” In the letter, he writes that it “would seem inappropriate to speak of one of these hypothetical entities as a particle of light, a corpuscle of light, a light quantum, or a light quant, if we are to assume that it spends only a minute fraction of its existence as a carrier of radiant energy, while the rest of the time it remains as an important structural element within the atom. It would also cause confusion to call it merely a quantum, for later it will be necessary to distinguish between the number of these entities present in an atom and the so-called quantum number. I therefore [propose for this] which is not light but plays an essential part in every process of radiation, the name photon.”
1958
The world’s first communications satellite, SCORE (Signal Communications by Orbiting Relay Equipment), is launched aboard an Atlas B missile, and it will shortly thereafter record a Christmas message to the world from President Eisenhower to be transmitted the next day.
1965
Gemini VII splashes down in the western Atlantic Ocean with command pilot Frank Borman and pilot Jim Lovell Jr. on board. The mission was launched on December 4 for the purpose of physiological testing and spacecraft performance evaluations.
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