In Hogwarts Legacy, astronomy tables are a collectible that you can find in Hogwarts and around the World Map. This collectible unlocks after completing the Astronomy Class main quest.
During this quest, you’ll be given a tutorial on how to use the astronomy tables to view constellations. As you may have guessed, these tables can only be used at night. To change the time, press R3 on the Map tab in your menu if necessary. Once you use a table, you’ll then need to line up the constellation with the circles by resizing and repositioning it. When it is correctly lined up, the constellation will be revealed!
Once you’ve completed the tutorial, symbols with a moon and star will appear on the map. These are the astronomy tables! Complete all of these challenges to earn rewards!