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Astronomers have pinpointed the moment Ansel Adams clicked the shutter on his famous photograph, Autumn Moon, the High Sierra from Glacier Point. It was taken on 15 September 1948, at 1903 precisely.
and
astronomers have pinpointed when Vincent Van Gogh painted "White House at Night" to the hour. The extraordinary precision was made possible by identifying a star in the sky as the planet Venus.
