Which point on the celestial sphere is directly opposite the zenith?

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Study for the Geodesy Refresher Exam. Prepare with multiple choice questions, hints, and explanations. Ace your exam with confidence!

Multiple Choice

Which point on the celestial sphere is directly opposite the zenith?

Explanation:
Directly opposite the zenith is the nadir. The zenith is the point straight up from your location in the sky. The nadir lies on the same line through your position and the Earth’s center but on the opposite side of the celestial sphere, exactly 180 degrees away. The other two references—celestial poles and celestial equator—are fixed features of the sky and are not simply opposite the zenith.

Directly opposite the zenith is the nadir. The zenith is the point straight up from your location in the sky. The nadir lies on the same line through your position and the Earth’s center but on the opposite side of the celestial sphere, exactly 180 degrees away. The other two references—celestial poles and celestial equator—are fixed features of the sky and are not simply opposite the zenith.

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