USPS Postmark on Astronomer Clyde William Tombaugh

usps pluto postmarkThe USPS has issued a postmark on 9th July 2016 on American astronomer Clyde William Tombaugh from his birthplace, Streator, Ill.Tombaugh is credited with discovering Pluto in 1930 when he was 24. Working at the Lowell Observatory in Flagstaff, Ariz., he was successful in locating what was then considered a ninth planet, based on the calculations of astronomer Percival Lowell.

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