Question

The point on the celestial sphere directly above an observer's head is called the

Answer 1

It is called the Zenith

Answer 2

The zenith is the point directly above the observer's head, at the top of the celestial sphere. The next important reference is the horizon. ... Extend the Earth's poles out to the celestial sphere and mark the intersections as the North Celestial Pole and the South Celestial Pole.