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A. E. (Andrew Ellicott) Douglass (July 5, 1867 in Windsor, Vermont – March 20, 1962 in Tucson, Arizona) 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.
Steward Observatory owes its existence to the efforts of American astronomer and dendrochronologist Andrew Ellicott Douglass.In 1906, Douglass accepted a position as Assistant Professor of Physics and Geography at the University of Arizona in Tucson, Arizona.
Andrew Ellicott (January 24, 1754 – August 28, 1820) was an American land surveyor who helped map many of the territories west of the Appalachians, surveyed the boundaries of the District of Columbia, continued and completed Pierre (Peter) Charles L'Enfant's work on the plan for Washington, D.C., and served as a teacher in survey methods for Meriwether Lewis.
Banneker would go on to be a leading astronomer, mathematician, clockmaker, and most of all, a surveyor. The second man was Andrew Ellicott . He would go on to do several prominent surveys of the area and assist Lewis and Clark in planning their expedition.
In 1788, George Ellicott, a son of Andrew Ellicott, loaned Banneker books and equipment to begin a more formal study of astronomy. [30] [31] [32] During the following year, Banneker sent George his work calculating a solar eclipse. [30] [31] [29] In 1790, Banneker prepared an ephemeris for 1791, which he hoped would be placed within a published ...
David Rittenhouse (April 8, 1732 – June 26, 1796) was an American astronomer, inventor, clockmaker, mathematician, surveyor, scientific instrument craftsman, and public official. Rittenhouse was a member of the American Philosophical Society and the first director of the United States Mint .
George Ellicott (1760–1832) was a son of Andrew Ellicott, who with his two brothers (all were Quakers from Bucks County, Pa.) founded Ellicott's Mills (now Ellicott City), Maryland. [1] He was a mathematician, an amateur astronomer, a younger cousin of surveyor Major Andrew Ellicott and a friend of Benjamin Banneker.
Virginia Louise Trimble (born November 15, 1943) is an American astronomer specializing in the structure and evolution of stars and galaxies, and the history of astronomy. [2] She has published more than 600 works in Astrophysics, [ 3 ] and dozens of other works in the history of other sciences.