In the 1790s, Banneker became an active writer of almanacs. He also was later appointed by President George Washington to be part of the District of Columbia Commission. He was the first Black man to be a government official.
Banneker’s magnum opus was his almanac called “Pennsylvania, Delaware, Maryland and Virginia Almanack and Ephemeris.” It was published for six consecutive years between 1792 and 1797. These almanacs included his astronomical calculations, op-ed pieces, literature, medical and tidal information.