This is not quite right. The SES-2 Satellite is not infinitely far away from you, but over the equator at 22,500 miles.
So for example. Seattle is approximately at 47.5 degrees latitude. By you approximation, the satellite should be at 90-47.5 = 42.5 degrees. This for example is the angle to the stars, or the sun.
But the satellite is much lower to the horizon. In Seattle, it’s at 25.7 degrees.
DETERMINATION OF LOOK ANGLES TO GEOSTATIONARY COMMUNICATION SATELLITES By Tom,is Soler, 1 Member, ASCE, and David W. Eisemann-’
There’s no cute short-hand way of calculating the proper angle.
Save yourself the trouble, use an online webpage sat locator like dishpointer.com It will compute your compass declination as well.