Official rule text
THREE-PLAYER GALAXY SETUP Match the numbers in the leftmost corner of each system tile to the preset map on the right to create the three-player galaxy. After placing the system tiles of the preset galaxy, each player places their home system in the space indicated on the diagram by the green system tile that is nearest to their position around the table. FOUR-PLAYER GALAXY SETUP Match the numbers in the leftmost corner of each system tile to the preset map on the left to create the four-player galaxy. After placing the system tiles of the preset galaxy, each player places their home system in the space indicated on the diagram by the green system tile that is nearest to their position around the table. 22
View official source
Source: Twilight Imperium: Fourth Edition - Rules
Expansion: Base Game
Version: source text