Hi Al
I’ve just added a quick and dirty diagram which shows the following:
- Earth rotates about its N – S axis of rotation.
- The Equator is at right angles to the axis of rotation.
- Brisbane is at Latitude 27.5 deg South.
- As I stand in my back garden, the plane of my Horizon stretches out.
- My Horizon plane is at right angles to the imaginary line joining Brisbane with the centre of the Earth.
- The SCP appears to lie on an imaginary line 27.5 degrees above my Horizon due to the geometry of a line intersecting two parallel lines.
Hope that makes it clearer?
Cheers
Dennis