August 23

79 – Mount Vesuvius begins stirring, on the feast day of Vulcan, the Roman god of fire.
1609 – Galileo demonstrates his invention, the telescope.
1966 – NASA's Lunar Orbiter 1 takes the first photograph of Earth from its orbit around the Moon.
1991 – The "World Wide Web", often referred to as the "information supercenter", is opened to the public.