There was some discussion yesterday about the answer being either "arctic circle" or "tropic circle". I've never heard of tropic circle, but that doesn't mean it doesn't exist! Could I have some opinions about what others have put please.
According to Chamber's: tropic (noun) an imaginary circle in the celestial sphere about 23 degrees 28 minutes north (Cancer) or south (Capricorn) of the equater,.... etc.
From the Greek tropos, a turning. So I do not think you can have a tropic circle. I have gone for Arctic.
I have gone with Arctic Circle - I don't think Tropic circle is correct. There is Tropic of Cancer and Tropic of Capricorn but I have never heard of Tropic circle.