celestial sphere; the heavens
Astronomical term for the imaginary sphere on which celestial bodies appear to lie. Also used poetically for the sky or heavens.
Observe the positions of stars on the celestial sphere.
Looking up at the night sky, countless stars appear scattered across the celestial sphere.
celestial coordinates
From 天 (heaven, sky) and 球 (sphere). A straightforward compound describing the astronomical concept of the celestial sphere.