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