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culmination the highest point; zenith; climax. [1/2 definitions]
meridian the highest point or peak; zenith. [1/7 definitions]
nadir the point on the heavenly sphere directly below a specified position on the earth's surface and at the other end of the diameter drawn from the zenith. [1/2 definitions]
vertical circle an imaginary circle on the celestial sphere that passes through the zenith and nadir and is thus perpendicular to the horizon.