

For flat-faced sundial. Gnomon angle should be same as latitude
Sundial hour angles for 54.8 degreesFormula: tan D = (tan t)(sin H) where D is the degrees needed, t is the angle of arc of each hour and H is the latitude.
AM and PM hour angles are the same, deviating from true-north pointing noon line
Hour | Angle |
---|---|
0.5 | 6.14° |
1 | 12.35° |
1.5 | 18.7° |
2 | 25.26° |
2.5 | 32.09° |
3 | 39.25° |
3.5 | 46.8° |
4 | 54.76° |
4.5 | 63.12° |
5 | 71.85° |
5.5 | 80.85° |
6 | 90° |