1982 2002 1972 1962
28 inch refracting telescope Transit circle telescope 12.8 inch refracting telescope Zenith Sector Telecope
1680 1780 1580 1880
Longitude Lunar Phases Solar Phases Comets
Knowledge of Moon Knowledge of Stars Timekeeping Navigation at Sea
GMT GMT - 1hr GMT + 2hr GMT + 1hr
+ 2mins + 10 mins + 1 min +5 mins
H2 H3 H4 H1
Church Services Canal Services Farmers Railway Timetables
Hexagonal Pentagonal Octagonal Cubed