Sundial angle calculator

Hour angles for a flat-faced sundial in the northern hemisphere. The gnomon angle should be same as your latitude and noon should point to true north.

 

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

---