One Eighth of a Circle's Circumference
This page is the CodyCross answer for the clue below from Tracking Time, Group 1054, Puzzle 1 (Mechanical Timer).
Question is: One Eighth of a Circle's Circumference
and the answer is: OCTANT
Word Meaning:
OCTANT — The eighth part of a circle; an arc of 45 degrees.
Definitions from Wiktionary.