Rittenhouse was a renowned American astronomer, inventor, mathematician, surveyor, and the first director of the US Mint. A clockmaker by trade, he developed many mathematical instruments, as well as perhaps the first telescope in the US. He later used tools he created to establish several state lines as well as part of the boundary known as the Mason-Dixon Line. What is said to have happened to Rittenhouse in 1769 as he observed the rare transit of Venus that he had long anticipated? Discuss