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

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

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

In terms of or by means of the zenith.

plural of zenith

(astronomy) Synonym of zenith telescope

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

plural of zenith telescope

plural of zenith sector

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.