As you know, the Sun moves around the center of the Galaxy at a speed of about 250 km / s, and at the moment this movement

As you know, the Sun moves around the center of the Galaxy at a speed of about 250 km / s, and at the moment this movement occurs in the direction of the constellation Cepheus. Why is it written in many books that the apex of the Sun’s motion is in the constellation Hercules?

Both the Sun and all nearby stars participate in the movement around the center of the Galaxy, but the magnitudes and directions of their velocities are slightly different. The apex in the constellation Hercules is the direction of the speed of the Sun relative to a group of nearby stars, also orbiting the center of the Galaxy. The magnitude of this speed is about 20 km / s.

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