fzero, thank you so much. I was trying to use dot products and angles too, but it wasn't working. Including the angle to the horizon was a great idea. I wanted to include a minimum elevation, so I did the following.
##\theta < \gamma - e##
Where e is the minimum elevation angle.
Next steps...
I've been trying to figure out how to calculate if a satellite is in view of a ground station (and above a certain elevation) using just position vectors for both satellite and ground station. Does anyone know of an equation, algorithm, etc. that does this?
Thanks