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(ˈzi nə θəl; esp. Brit. ˈzɛn ə-)

1. of or pertaining to the zenith; situated at or near the zenith.
2. (of a map) drawn to indicate the actual direction of any point from the center point.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Adj.1.zenithal - relating to or located at or near the zenith
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References in classic literature ?
Its transcendental aspirations--still unconsciously based on the geocentric view of things, a zenithal paradise, a nadiral hell--were as foreign to his own as if they had been the dreams of people on another planet.
ZHR: Zenithal hourly rate; expected maximum rate under observing conditions when stars of 6.5-mag.
The International Meteor Organization (IMO) predicts a zenithal hourly rate (ZHR) of around 120 this year.
A zenithal hourly rate of about 15 meteors might occur in the late hours of November 21 until dawn of the following day.
[16] introduced the solar zenithal angle, the total cloud coverage, the visible percentage of sun, and the existence of rain in sky images to describe the physical property.
In order to maintain the window size constant, a zenithal projection of the scene (also known as bird eye view: BEV) is reconstructed.
10-12, with a zenithal hourly rate (ZHR, the number of meteors visible in an hour of peak activity to one person on the ground) upward of 60.
Caption: Figure 2 (a) Radial distribution of matter and (b) zenithal distribution.
The greenhouse had a 200-pm-thick polyethylene cover, with zenithal and lateral ventilation with an anti-aphid mesh.
14 Castor in Gemini 100 Parent comet Moon Name (or asteroid) phase Quadrantids 2003 [EH.sub.1] waning crescent Lyrids 1861 G1/Thatcher full Eta Aquariids 1P/Halley new Delta Aquariids 96P/Machholz last quarter Perseids 109P/Swift-Tuttle waxing gibbous Orionids 1P/Halley waning gibbous Leonids 55P/Tempel-Tuttle waning gibbous Geminids 3200 Phaethon full * The likely peak zenithal hourly rate (ZHR): the number a single observer would see per hour If the radiant were at the zenith and the sky were dark enough for magnitude-6.5 stars to be seen.