William Markowitz, US astronomer

William Markowitz, US astronomer

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Credit: AIP Emilio Segre Visual Archives, John Irwin Slide Collection /SCIENCE PHOTO LIBRARY

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Caption: William Markowitz (1907-1998), US astronomer. Markowitz is best known for his work on the standardisation of time. He developed the ephemeris time scale as an international time standard and worked with British physicist Louis Essen to calibrate atomic clocks in terms of the ephemeris second. he was president of the International Astronomical Union (IAU) commission on time from 1955 to 1961. Photographed at an IAU meeting in Sydney, Australia, on 22nd August 1973.

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