How to unlock the astrolabe for novice "Light Encounter"?

1. After entering the game, we need to enter the map of Ye Yun from Chen Dao, as shown in the following figure.

2. Next, you can send it back to the encounter, as shown in the figure below.

3. Next, I found that after returning to the encounter, I can see that my friend's astrolabe has been unlocked, as shown below.

4. Finally, you need to find your friends after clicking, as shown in the figure below.