Four years after her work The Explication of the Vision to Ezekiel, a work about this quantity was written by Elizabeth Johnson. The celatone was designed to help determine this quantity. The efforts of Tobias Mayer to help determine this quantity are discussed in a book that also describes the conservation efforts of Rupert T. Gould and the death of Sir Cloudesley Shovell. A 1714 Act of Parliament established a (*) ‘Board’ to incentivise research into methods of determining (10[1])this (10[1])quantity, as discussed in a book by Dava Sobel. It’s not time, but H-4 and other marine chronometers were developed to help measure this quantity by (10[1])John Harrison. Two rival baselines for this quantity were named for Paris and Greenwich (“GREN-itch”). For 10 points, name this quantity which measures east-west position on a globe, contrasted with latitude. ■END■