Andrew Ellicott Douglass
✓ Source-basedfallingAmerican astronomer and dendrochronologist (1867 - 1962)
A. E. Douglass was an American astronomer and archaeologist. 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.
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![[2] Prof. A.E. Douglass and the newly installed Steward Observatory 36-inch Telescope](https://upload.wikimedia.org/wikipedia/commons/thumb/3/35/Douglass_and_Steward_Telescope_1922.jpg/500px-Douglass_and_Steward_Telescope_1922.jpg)
Scientists from United States 6
About this person
A. E. Douglass was an American astronomer and archaeologist. 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.
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