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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.
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.
Benjamin Banneker (1731-1806) was a free African American mathematician and astronomer who assisted Andrew Ellicott during the first three months of the 1792 — 1793 survey of the District of Columbia's original boundaries. [7] The stone is one of 40 markers that once lined the District's boundaries.
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.
14825 Fieber-Beyer (Sherry Fieber-Beyer, American Astronomer/Planetary Scientist) 15395 Rükl (Antonín Rükl) 15420 Aedouglass (Andrew Ellicott Douglass, American astronomer) 15467 Aflorsch (Alphonse Florsch, French astronomer) 15955 Johannesgmunden (John of Gmunden) 15963 Koeberl (Christian Koeberl) 16682 Donati (Giovanni Battista Donati)
The astronomer used the instrument to measure the zenith distance, an angle created between a star’s position in the sky, the observer, and the point in the sky directly above the observer, the ...
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.
For the scientists, he chose the astronomer/surveyor Thomas Freeman, who had recently been with Andrew Ellicott on his survey of the southern boundary of the United States, and Peter Custis, who was the first academically-trained naturalist to accompany an expedition, was still a medical student in Philadelphia, [1] and served as the group's ...