[Elsie]

Using the same dynamic of gravity, the Sun is rotating around the galactic center, which some evidence suggests is a giant black hole.

And the Milky Way is rotating around a galactic center, also, if I remember correctl.

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

Would that be a correct statement?

[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.