Mercator Cooper
American whaler (1803–1872) / From Wikipedia, the free encyclopedia
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Mercator Cooper (September 29, 1803[1] – March 23 or April 24, 1872) was a ship's captain who is credited with the first formal American visit near Edo (now Tokyo), Japan and the first formal landing on the mainland East Antarctica.
Both events occurred while sailing ships out of Sag Harbor, New York.