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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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