celestial sphere

noun
Updated on: 9 May 2018

Definition of celestial sphere

: an imaginary sphere of infinite radius against which the celestial bodies appear to be projected and of which the apparent dome of the visible sky forms half

Recent Examples of celestial sphere from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'celestial sphere.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of celestial sphere

1829

in the meaning defined above

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