|Birth Day||November 9, 1731|
|Birth Place||Baltimore, MD|
|Age||288 YEARS OLD|
|Died On||Oct 9, 1806 (age 74)|
African American scientist who authored a series of almanacs and was known for his knowledge of astronomy.
He grew up on his family's farm, and studied independently while he worked on the farm.
He was a member of the team that surveyed the original border of the District of Columbia.
He never married and lived on his family farm for most of his life.
He was a contemporary of Thomas Jefferson, with whom he corresponded on the issues of slavery and racial equality.