2. First, rotate the astrolabe, just aim at the outermost four, and don't aim at the four small characters in the inner circle (PS: the inner circle is to interfere with the outside).
3. It should be noted that don't turn the astrolabe immediately after alignment, because it takes several seconds to activate, and this setting is very pit. Many impatient travelers waited for a second and found it useless, so they began to manipulate the astrolabe.
4. The way to use the rotating astrolabe is to aim at the four characters outside and stay for a few seconds.