Why is “north” “up” on a map?
I don’t understand the question…
Ok… it’s because the map makers (cartographers) that made the first maps drew them from “their perspective” and now, as you might have figured out from the above projections, it gets a bit hard to compare if it doesn’t continue somewhere along the same line…
Header image: By Strebe – Own work, CC BY-SA 3.0, Link