It was also a Black man...........the same Ben Banneker.......who made America's 1st clock........Big Ben in London......next to Westminster Abby............Key West.........the Key bridge from Rosslyn, Virginia..........to the Georgetown section of Wash DC.......................

A barber shop's clock runs counterclockwise..........so when u are looking in the mirror............as they cut your hair..............it will show the correct time.........................backwards innuendos and codes..........mirror symmetry Leo Da Vinci................

Notable works

In 1753 at about the age of 21, Banneker completed a wooden clock that struck on the hour. He appears to have modeled his clock from a borrowed pocket watch by carving each piece to scale. The clock purportedly continued to work until his death.^[20][21]

Total solar eclipse (1999)

After his father died in 1759, Banneker lived with his mother and sisters.^[4][22] In 1768, he signed a Baltimore County petition to move the county seat from Joppa to Baltimore.^[23]
In 1772, brothers Andrew Ellicott, John Ellicott and Joseph Ellicott moved from Bucks County, Pennsylvania, and bought land along the Patapsco Falls near Banneker's farm on which to construct gristmills, around which the village of Ellicott's Mills (now Ellicott City) subsequently developed.^{[16][24][25][26]} The Ellicotts were Quakers and shared the same views on racial equality as did many of their faith.^[25][27] Banneker studied the mills and became acquainted with their proprietors.^[24][28]
In 1788, George Ellicott, the son of Andrew Ellicott, loaned Banneker books and equipment to begin a more formal study of astronomy.^[5][29][30] During the following year, Banneker sent George his work calculating a solar eclipse.^[5][29][31]
In 1790, Banneker prepared an ephemeris for 1791, which he hoped would be placed within a published almanac. However, he was unable to find a printer that was willing to publish and distribute the almanac.^[5][32]