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B
Celestial equator
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C
Meridian
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D
Nadir
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Solution
The correct option is C Meridian
When we extend earths equator in all directions, it penetrates the celestial sphere along a circle called as celestial equator.
Meridian is the great circle that passes through both zenith and nadir.
The point exactly below the observer on the celestial sphere is called Nadir.