With respect to stars of spectral classes from A to G, the Sun moves in the direction a = 18h, 6 = + 30 ° at a speed of 19.7 km / s.

With respect to stars of spectral classes from A to G, the Sun moves in the direction a = 18h, 6 = + 30 ° at a speed of 19.7 km / s. The movement of the Sun relative to nearby stars occurs in the direction a = 17h40m, 6 = + 21 ° and is 15.5 km / s. Explain why there is such a difference? Is it natural that in the second case the speed of the Sun is less?

Most of the nearby stars are red dwarfs. The Sun moves with them around the center of the Galaxy and quite predictably has a low speed relative to them. Consequently, the stars of classes A-G are located somewhat further than the nearest stars “They also move around the center of the Galaxy” but with slightly different speeds. From here follows the difference in the direction of relative motion and a large relative speed.

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