adamshostack
Calculation for Finding the Longitude
"First produced in 1768, this worksheet gave navigators an easy process for calculating their longitude using new instruments and the Nautical Almanac. Each naval ship's master was required to train with qualified teachers in London or Portsmouth in order to gain a certificate of navigational competence" -- museum placard. Posting in honor of John Harrison's 352nd birthday, and to show that the fight continues.
Calculation for Finding the Longitude
"First produced in 1768, this worksheet gave navigators an easy process for calculating their longitude using new instruments and the Nautical Almanac. Each naval ship's master was required to train with qualified teachers in London or Portsmouth in order to gain a certificate of navigational competence" -- museum placard. Posting in honor of John Harrison's 352nd birthday, and to show that the fight continues.