Definition of "zenithal" []

• Of or pertaining to a zenith (adjective)
• Azimuthal (adjective)

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• "He improved the methods of astronomical measurement, invented the zenithal collimator, suggested and applied photography and electricity to astronomy, and dealt with problems of physical astronomy, the shape of comets, the spots of the sun, meteors, etc."
• "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."
• "A thick fog came down on us, with zenithal aurora borealis, the electric action of which threw out every compass, standard and otherwise, on board."