Hi George,
Again, Malcolm has come up with the goods.
On our tracking mounts we have to set what speed according to which object we are viewing. eg. Celestial (for the stars) Lunar (for the Moon) and Solar (for the Sun)
Once you wrap your head around that, plus the fact that the Earth is tilted on a 23 degree angle, you can see that objects can seem to be moving a bit skew iffy up there.