What's the difference between horology and orology?
Horology
Definition:
(n.) The science of measuring time, or the principles and art of constructing instruments for measuring and indicating portions of time, as clocks, watches, dials, etc.
Example Sentences:
(1) Broadly speaking, the further north you go, the nastier the predominant reading matter borrowed, a pattern that might invite sociological, meteorological and even horological (fewer winter daylight hours) explanations.