Easy as in sky A concept used in astronomy, referring to an imaginary, vast, and perfectly round shell that surrounds the Earth. It serves as a simplified representation of the sky, helping astronomers locate and describe celestial objects. Clear All
1 Example Sentence Showcasing the Meaning of 'Celestial Sphere'
A key aspect of the planetarium exhibit was the interactive demonstration allowing visitors to manipulate a model of the celestial sphere.
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