Angle for the effect of elevation

[javimed]

Hi. Shouldn't be theta1 and not alpha the depression adjustment? In the Effect of elevation image on index.rst I think the depression angle should be the one between C-B-and the horizontal: which is theta. And you'll see that if elevation tends to infinity theta tends to 90 degrees but alpha only to 45 degrees which doesn't make much sense to me. I think the adjustment could be theta.