(astronomy) The point in the sky vertically above a given position or observer; the point in the celestial sphere opposite the nadir.

plural of zenith

Of or pertaining to a zenith. / (cartography, of a projection) azimuthal

In terms of or by means of the zenith.

(rare) Of, pertaining to, or characteristic of a zenith.

The passing of the sun directly overhead such that no shadows are cast by a pole sticking straight up from the ground. These conditions only occur in locations between the Tropic of Cancer and the Tropic of Capricorn.

plural of zenith sector

plural of zenithal passage

(astronomy) A telescope that can point vertically at the zenith

plural of zenith telescope