This puzzle can only be done at night.
Then follow the walkthroughs then - from wt quote:
1. Study the tapestry riddle
2. Enter the coordinates of specific constellations on the wheel.
3. Look through the telescope to see the constellation.
Identify the constellation seen by searching for it on the constellation table at lower level.
Look through the telescope again and highlight only the star that is in reference to the tapestry riddle.
Complete one constellation at a time.
Use the hint feature of the game.
The coordinates and picture of the constellation are in the walkthrough.