American astronomer, was born at Boston, February 15, 1858. He
graduated from the Massachusetts Institute of Technology in
1879 and taught there from 1880 to 1887. In 1887 he became
professor of astronomy at Harvard, and was interested in
astrophotography. He found photographically that the entire
constellation of Orion is immersed in nebulosity.  In 1891 he
and his brother,. Edward Charles Pickering, together established
a southern Harvard station at Arequipa, Peru. He
and Andrew E. Douglass proved the dark areas of Mars were
not seas. In 1893 Dr. Percival Lowell commissioned him and
Douglass to establish the Lowell Observatory at Flagstaff,
Arizona. Pickering returned to Harvard and discovered
Saturn's ninth satellite. He established another Harvard Station at Mandeville, Jamaica, and made extensive lunar surveys. His work, The Moon, was published in 1903.  Later he announced changes observed on the moon. Pickering also
did original research on meteors and novae.  He made a
major contribution on trans-Neptunian planets, reaching conclusions essentially similar to John Lowell's; and Pluto was
later found nearer Pickering's predicted position.  He also
believed in other trans-Neptunian planets. Pickering was one
of the world's leading observers, the planets being his main
interest. Under his direction many reports on Mars were
made, and he was a prolific writer of astronomical papers
He died January 16, 1938.

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