Historical Rules · 10 August 2018
Rule 807.4b
Official source text from the 10 August 2018 Rules release
The starting player in the game gets the first turn marker. The player four seats to that player’s left (the fifth player) takes the second turn marker, and so on until all the turn markers have been handed out. Each turn marker is assigned a number in this way. Then all players with turn markers start their turns at the same time.