Search results
Results from the WOW.Com Content Network
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.
Andrew Ellicott, an early American astronomer, was the first to record a sighting of a meteor shower.
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)
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.
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 ...
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 ...
At the beginning of the twentieth century, astronomer Andrew Ellicott Douglass first applied tree ring dating to prehistoric North American artifacts. Through applying dendrochronology (tree-ring dating), Douglass hoped for more expansive climate studies. Douglass theorized organic materials (trees and plant remains) could assist in visualizing ...