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abstraction > mathematical concept > geometrical object > plane > horizon |
horizon comparison table |
Subject | is a kind of | has definition |
---|---|---|
plane | geometrical object | |
horizon | plane | A plane perpendicular to the line from an observer to the zenith. The great circle formed by the intersection of the celestial sphere with a plane perpendicular to the line from an observer to the zenith is called the astronomical horizon. |
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