I want to calculate the elevation (view) angle of a satellite using the incidence angle.see image
On this site there is a tool which you can use to calculate it but without description.
https://www.intelligence-airbusds.com/en/8719-angle-conversion
Does any body have an idea how I could do that? Additionally I have the satellite position and the earth is an ellipsoid.
As far as I see the drawing is following: