celestial sphere

Believing that spacetime is a real, physical entity is no more defensible than believing in the old idea of a celestial sphere.

But from a terrestrial perspective, the celestial sphere appears essentially unchanging.

This pairing hums with a soft energy, attuned perhaps to the same celestial spheres that Gouverneur hoped to crack open.

But there’s no need to be perfectly versed in every detail of the celestial sphere.

In his only surviving work, Hipparchus criticized earlier astronomical writers for not caring about numerical accuracy in their visions of orbits and celestial spheres.