What is the meaning of celestial sphere?

(DoD, NATO) An imaginary sphere of infinite radius concentric with the Earth, on which all celestial bodies except the Earth are imagined to be projected.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
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APAMilitary Dictionary (DoD). (2011). celestial sphere. Retrieved September 20, 2026, from http://smartdefine.org/celestial_sphere/definitions/1960709
ChicagoMilitary Dictionary (DoD). 2011. "celestial sphere" http://smartdefine.org/celestial_sphere/definitions/1960709 (accessed September 20, 2026).
HarvardMilitary Dictionary (DoD) 2011, celestial sphere, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/celestial_sphere/definitions/1960709>.
MLAMilitary Dictionary (DoD). "celestial sphere" 4 April 2011. Web. 20 September 2026. <http://smartdefine.org/celestial_sphere/definitions/1960709>
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