Click each hint to reveal it. Try the earlier hints before looking at later ones!
The telescope on the desk is the key focus of this room. Try adjusting its lens.
Point the telescope at the painting on the north wall — you will see a hidden constellation pattern.
The constellation matches the dial on the safe. Rotate each ring to recreate the pattern you saw.
The correct combination is: outer ring = 3 stars, middle = 7, inner = 2. The safe will click open.