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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.
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 ...
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 ...
Astronomer Francis Baily is noted for first observing Baily’s beads during a total solar eclipse. He also toured the unsettled regions of the United States in the 1790s, including a visit to ...
Andrew Ellicott of Ellicott's Upper Mills, Maryland, authored a series of almanacs, The United States Almanack, the earliest known copy of which bears the date of 1782. [29] Benjamin Banneker, a free African American living near Ellicott's Mills, composed a series of almanacs for the years of 1792 to 1797. [30]