why do they mention north star?

In ritual, the mention of the North Star occurs within the twelfth degree of the Scottish Rite—that of Grand Master Architect—where the candidate is received when the day star rises in the east and the North Star looks down upon the seven stars circling around it, rather than in the three degrees of the Craft 1.

Albert Mackey interprets the symbol as representing truth 1. In his reading, the North Star is the Pole Star or Polaris, serving as the mariner's guide over the stormy seas of time 1. The name also appears in Masonic governance, such as the Grand Lodge Den Norske Polarstjernen (The Norwegian Polar Star), constituted in 1920 1.