ZENITH, n. That point in the visible celestial hemisphere, which is vertical to the spectator, and from a which a direct perpendicular line passing through the spectator, and extended, would proceed to the center of the earth. It is opposed to nadir.
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zenith appears in definitions for these words:
Almucantar Aurora Azerit Cardinal Circle Complement Horizon Meridian Nadir Oblike Overhead Point Pole South Vertex Vertical Vertically Verticalness
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