How Sundials Work Part: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Part 10. Flat edged gnomons and the noon gap. (Click to show larger versions) Part: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20