Any Imaginary Semicircle on the Earth's Surface
This page is the CodyCross answer for the clue below from Medieval Times, Group 236, Puzzle 2 (Feast of Fools).
Question is: Any Imaginary Semicircle on the Earth's Surface
and the answer is: MERIDIAN
Word Meaning:
MERIDIAN — In full celestial meridian: a great circle passing through the poles of the celestial sphere and the zenith for a particular point on the Earth's surface.
Definitions from Wiktionary.