[Dominic Harr]

And, these rotations are so small as to not necessary to be considered when RadioAstronomer makes orbital calculations.

I s'pose it depends on the accuracy required. I don't really know what he does, you'd have to ask him.

If you want to be 100% accurate, you'd have to include them. But I would imagine that the effect is so small that it might not be relevant to most real calculations you'd need to do.

[RadioAstronomer]

I do take into account galactic rotation and other motions, just by the fact the stars are "drifting" referenced to the sun/earth/moon.