Douglass, A. E. (Andrew Ellicott), 1867-1962

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Summary: A. E. Douglass was an American astronomer. He discovered a correlation between tree rings and the sunspot cycle, and founded the discipline of dendrochronology, which is a method of dating wood by analyzing the growth ring pattern. He started his discoveries in this field in 1894 when he was working at the Lowell Observatory. During this time he was an assistant to Percival Lowell, but fell out with him when his experiments made him doubt the existence of artificial "canals" on Mars and visible spokes on Venus. Wikipedia
Gender or Sex: Male [1][2][3][4][5]
Born: 1867 [3]; 1867-07-05 [1]
Birth Place: Windsor [1]; Windsor, Vt. [4]
Died: 1962 [3]; 1962-03-20 [1]
Death Place: Tucson [1]; Tucson, Ariz. [4]
Country: United States [3]
Language: English [4]
Occupation: astronomer [1]; archaeologist [1]; university teacher [1]; dendrochronologist [1]; botanical collector [1]; scientific collector [1]
Profession: Astronom [3]
Employer: University of Arizona [1]
Educated at: Trinity College [1]
Country of Education: United States [1]
Archives at: University of Arizona Libraries [1]
Encyclopædia Britannica: Biography [1]
Yale LUX: Entity [1]
British Museum person-institution thesaurus: Entry [1]
Oxford Reference: Overview [1]
American National Biography: Biography (requires subscription) [1]

Sources: 1. Wikidata; 2. VIAF; 3. Deutsche Nationalbibliothek (Germany); 4. Bibliothèque nationale de France; 5. Library of Congress

Last updated Dec 17, 2025