Question

2 which term, taken from the celestial sphere, gives its name to a.m. and p.m.?
great circle
equinox
meridian
zenith
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Explanation:

The terms a.m. (ante - meridiem) and p.m. (post - meridiem) are related to the meridian. Ante - meridiem means before the meridian (mid - day) and post - meridiem means after the meridian. A great circle is a general concept in geometry of spheres, equinox is related to the sun's position in relation to the Earth's equator, and zenith is the point directly above an observer.

Answer:

C. Meridian