|This manuscript is by the Oxford astronomer Thomas Hornsby. It includes several sections devoted to calculations and analysis of the 1769 transit.
The open pages show him systematically combining the observations at “Georges Island” (Tahiti) with those from a wide range of other observing stations, from California to Oxford. There are many further pages given over to similar calculations. But Hornsby was not just a “computer”. He also has passages commenting on and assessing the quality of the data. Here he discusses a set of Russian observations.