For as long as I can remember, there has been a map in the ticket hall of Piccadilly Circus tube station supposedly showing night and day across the time zones of the world.

But this map has always fascinated me and still does, even though it now seems very primitive.

This is because it chops the world up equally by longitude, without regard the reality of either political divisions or the changing seasons.

This is somewhat surprising given the London Underground's history difficulty in grasping the concept of punctuality.