I have a doubt and I hope someone can help me: I would like to make a Shepherd´s (cilyndrical) dial, and I found the following equation to calculate the size of the gnomon: G = H cot(113,5º - lat) Where: G is the size of the gnomon H is the height of the dial scale lat is the local latitude
The problem is that I live in a city over the capricorn tropic (23,5º), and it is not possible to calculate cot (113,5-23,5) = cot(90º). Thank you
