In terms of or by means of the zenith.

plural of zenith

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

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

(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 telescope

(astronomy) Synonym of zenith telescope

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

plural of zenith sector