Assertion: celestial sphere's star | /r/HasProperty | empirical reason
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text: And I used to think the empirical rationale of the spheres was that on a clear night in the Med the stars actually look just like the inner concave surface of a sphere, and this empirically based perception was then extended to the planets, albeit 'irrational' because there was no empirical reason to put the single planets on whole spheres rather than just on single wheels or rings once it had been decided they were nearer than the stars rather than also on the stellar sphere.