Sundial Angle Calculator
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For flat-faced sundial. Gnomon angle should be same as latitude

Enter latitude as decimal:   
Sundial hour angles for 54.8 degrees
Formula: 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

HourAngle
0.56.14°
112.35°
1.518.7°
225.26°
2.532.09°
339.25°
3.546.8°
454.76°
4.563.12°
571.85°
5.580.85°
690°