zenithal

‘zri-nz-Oat adj. of the zenzth. zenith-distance ‘zii-nz@,distns mn. the angular distance of any body from the zenith or vertex of the hevens; the arc or portion of a great circle of the hevens intercepted between the zenith and any ebject in the sky; the cozaltztude. Zeppelin ‘zep a-lin n. a dirigible balloon of the type devetopt by Ferdinand von Zeppelin; a Zeppelin airship. zone zoon 2. a belt or band; specifically, one of the five arbrtrary divisions of the earth’s surface, bounded by lines parallel to the equator; a climatic belt: as, the-torrid *zone, or one of the temperate or frigid *zones; also, any herzzental or vertical belt, tract, or region, as of the atmosfere, differing 1n character from adjoining belts: as, a *zone of discontinuity. climatic zone, one of the zones, belts, or tracts girdling the earth and characterized by certain climatic conditions; one of a number of elengated or belt-like subdivisions of the surface of the globe distinguisht by succe iv drfferences of climate: as, Koeppen’s *climatic zones, Wojeikoff’s *climatre zones. sone of cyclones, the zone or belt between latitudes 30 and 60, characterized by the prevalence of cyclones due to the conflict of descending polar winds with ascending equatorial winds. sone of discontinuity, a zone or region of the atmosfere where the wind-conditions are discontinuous; the neutral aerial belt or tract constituting the meeting-place of the risrng airzcurrents and the upper-wind; an upper rnversionz zone; a calm-zone. zone of equilibrium, a zone, tract, stratum, or eee of the atmosfere 1m which a balloon a umes a condition of equilibrium, equzperse, balance, or stabrlaty, tending neither to rise nor fall. zone of mixture, a zone characterized by the mixture of conflretzng winds, such as a zone of cyclones.