Rotating constellation diagram

This classmate. . . The use of the star map is very simple. A rotating star map is generally composed of two disks. The date is printed on the outermost side of the big disk below, and the time is written on the small disk superimposed on it. First, align the date and time on the map. For example, the observation time is 1 month 1 night 10. Overlap the small disk scale at 10 at night with the large disk scale at 1 month 1 day, and the starry sky at that time will appear on the rotating star map. Then, we must distinguish and correct the direction. When you face the west, put down the western part of the map, hold the map high, and slowly compare it with the actual starry sky, and you can begin to observe the constellations. It is best to observe the constellations from the west, because the constellations in the west will sink to the horizon first. Start with bright stars (that is, larger points on the map). Choose a constellation with bright stars and clearly recognizable shapes as the observation object. Leo, Scorpio, Sagittarius, Cygnus, Orion, Cassiopeia and Big Dipper are all very suitable for initial recognition. With the help of the star map, the range of constellations in the sky is estimated. In this range, try to find other stars belonging to the constellation, and connect the stars with association force, and then try to see the shape of the constellation. After Ming successfully identified the constellation, he chose another constellation next to him for identification. Please note: when we use the map, we will lay it flat on the ground. But when we use the star map, we need to hold it high and look up. Have you noticed that the east-west direction on the star map is opposite to that on the ordinary map? I have recently observed meteors and constellations, and I often use rotating constellations. . . . You can ask me any questions.