What observations must be carried out to prove the rotation of the Sun around the center of the Galaxy?

It is necessary to carry out spectral observations of nearby stars of the Galaxy disk. The radial velocities of stars along the radius vector of the Galactic center will be equal to zero, and radial velocities in the direction of the apex antiapex of galactic rotation will also be absent. In the directions shifted by 45 ° from these directions, on the contrary, the radial velocities will be maximum.

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