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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.
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.
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 ...
In 1763 Mason and Dixon began a survey of the Pennsylvania–Maryland border, but this work was interrupted in 1767. In 1784 Rittenhouse and Andrew Ellicott completed this survey of the Mason–Dixon line to the southwest corner of Pennsylvania. When Rittenhouse's work as a surveyor ended, he resumed his scientific interests.
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 .
Ellicott was born in Bucks County, Pennsylvania on November 1, 1760. [2] He was the son of Quaker miller Joseph Ellicott (1732–1780) and Judith Blaker (1729–1809). Joseph's siblings included older brother Andrew Ellicott (1754–1820), a fellow surveyor, and younger brother Benjamin Ellicott (1765–1827), a U.S. Congressman.
On January 1, 1793, Andrew Ellicott submitted to the commissioners a report that stated that the boundary survey had been completed and that all of the boundary marker stones had been set in place. Ellicott's report described the marker stones and contained a map that showed the boundaries and topographical features of the Territory of Columbia.