OSA Timeline

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George A. Van Biesbroeck (1880-1974), 1920
George A. Van Biesbroeck (1880-1974), 1920, astronomer at Yerkes Observatory observing Mars. Credit: Smithsonian Institution

April 1920

George A. Van Biesbroeck (1880-1974), 1920

George A. Van Biesbroeck (1880-1974), astronomer at Yerkes Observatory observing Mars when it approached close to the earth in 1926, and using the 40 inch refracting telescope, the largest of its kind in the world