Galileo shows the Doge Leonardo Dona  his telescope. And 'August 21, 1609. From a painting by H. J. Detouche...

UNSPECIFIED - CIRCA 1754: Galileo shows the Doge Leonardo Dona  his telescope. And 'August 21, 1609. From a painting by H. J. Detouche (Photo by Universal History Archive/Getty Images)