How to Solve Greenroom Constellation Puzzle in Rivage
Look at the stars
After gaining Access Level 4, you can enter the Greenroom via the Laboratory train. It’s a beautiful location with some of the nicest music in the game. You’ll also encounter a puzzle related to constellations here. Here’s how to solve it.
Getting the Constellation Guide Book
The constellation guide book is locked inside the birdhouse-looking decoration next to the chessboard. The sun symbol on top of it will normally glow red. To open the box, interact with the Greenroom’s light control panel. Keep the setting to daylight and progress the day until you reach high noon. At high noon, the box’s sun will glow green, and you can open it.

Flipping through the book, you’ll see different constellations and their corresponding patterns. To make things easier, take screenshots of the pages.
Viewing the Constellations
To view the constellations, you must switch the Greenhouse to night mode. Then press the other button to progress time until it glows blue. When it has a blue glow, it means the constellations are visible.

Three constellations should be projected and glowing on the dome above you. They will be colored yellow, blue, and green. Find the corresponding constellation using the screenshots we took earlier.
Opening Amaan’s Constellation Chest
The chest is to the left of the shed and has three locks. The locks are yellow, blue, and green, respectively. These locks are supposed to be opened by drawing the appropriate constellation’s key on it.

Taking the Crank Back
If you grab the Crank and take it back, you can then use it to open Jahi’s room by inserting it into the panel on the wall and cranking it. However, doing so will cause the power to go out since the path to the Greenhouse and back consumes a lot of power.

To open Jahi’s room while keeping the power on, you have to place the crank inside the train to duplicate it for the next loop. This lets you retrieve it without spending extra energy. Now you can head back to Jahi’s room to continue the main story.
Note that the chessboard in the Greenroom is also a puzzle. Solving the chessboard gives you one of the seven Tarot cards.
If you’d like, return to the main guide to check out how to progress the story and solve the mysteries in Jahi’s room.