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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.
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Adj.1.zenithal - relating to or located at or near the zenith
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.
Winter's three bright zenithal figures marching in a row.
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.
The greenhouse had a 200-pm-thick polyethylene cover, with zenithal and lateral ventilation with an anti-aphid mesh.
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.
An introductory essay comments on the different ways light is mobilised and interpreted in the work: light as spirit, the immateriality/materiality of light, the primordial aspects of light, the 'moving eye' of the beholder in relation to ever-changing light, the question of zenithal light, light in its relationship to the cosmos, the roots of sacred space in ancient times and light.
Both time series were characterized by distinct zenithal and nadiral segments.
Divided into four levels, the ATF enhances technical support for the new antenna field and helps improve engineers' working conditions, while a central stairwell with zenithal lighting via multiple domes provides access to the different levels and various functional areas.
A zenithal hourly rate of about 10 meteors could occur in the late hours of November 17 until dawn of the following day, it added.
In order to project the zenithal delay to particular elevation angle, mapping functions like: Niell Mapping Function (NMF; Niell, 1996), Global Mapping Function (GMF; Bohm et al.
A fixed zenithal camera provides an image of target area which includes coloured robot grippers and coloured object.
In Kasama House, we do find elements such as the large overhanging roof reminiscent of samurai houses, offering zenithal light at the entrance and spaces with straw tatami mats.