a little circle ° above the number
If it is on a map for ocean travel it would mean degrees
s diameter of the circle in the drawing above is the segment
There is no greatest number for a circle.
The more populated parts of Canada are well below the Arctic Circle, but parts of Canada are above the Arctic Circle.
It is above the equator.
No, there are no snakes 'within' the Artic circle.
at or above the arctic circle and at or below the antarctic circle