zenith
That point, on any given observer’s celestial sphere, that lies directly above him; the point that is elevated 90° from all points on a given observer’s astronomical horizon.
Diametrically opposite the zenith is the observer’s nadir.
That point, on any given observer’s celestial sphere, that lies directly above him; the point that is elevated 90° from all points on a given observer’s astronomical horizon.
Diametrically opposite the zenith is the observer’s nadir.