How to determine the direction of the constellation _ How to determine the direction and position of the constellation

In which direction of the earth is the constellation?

Facing the center of the Milky Way in the south, the depth is 654.38+ million light years, so there are the most galaxies and nebulae in the sky from southeast to southwest. Sagittarius, Scorpio, SHIELD and Ophiuchus are all in this sky. There are fewer galaxies in the northern sky, because it used to be the disk of the Milky Way, and its thickness is relatively thin, which can only be said to be relative, and it is also 20,000 light years.