Andrew Ellicott Douglass Biography


Who is Andrew Ellicott Douglass? Information on the astronomer Andrew Ellicott Douglass biography, life story and works.

Andrew Ellicott DouglassAndrew Ellicott Douglass; (1867-1962), American astronomer and dendrochronologist, who originated the science of dendrochronology in 1901. He was born in Windsor, Vt., on July 5, 1867, graduated from Trinity College, Hartford, Conn., in 1889, and was appointed professor of physics and astronomy at the University of Arizona in 1906. He was the director of its Steward Observatory from 1918 to 1938. He died in Tucson, Ariz., on March 20, 1962.

Douglass developed dendrochronology as a result of an investigation of the theory that the sun affects the weather and the weather affects tree growth. Later, he established parallel patterns between the tree ring growth, climatic cycles, and sunspot variations, and he constructed an exact chronology of climatic variations over a period of nearly 2,000 years. His technique of dating events by rings in aged wood also proved useful in determining the dates of archaeological sites.

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