The Spheres: The Geocentric Universe According to Sacrobosco

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This diagram is found on folio 17r of MS Codex 1881. Diagrams representing the spheres as a series of concentric circles (sometimes known as "cosmic section" diagrams) are a common feature of De sphaera manuscripts and print editions. Click on the circles in this diagram to read more about each sphere.

The elemental spheres also appear in a small diagram on fol. 18v of MS Codex 1881: 

Elemental spheres

For the original image, see the rotating diagram.