Volume 3 / Book 2 — CHAPTER XIV. OF WHAT FIGURE THE STARS ARE.
Reading edition
The Stoics say that the stars are of a circular form, like the sun, the moon, and the world. Cleanthes, that they are of a conical figure. Anaximenes, that they are fastened as nails in the crystalline firmament; some others, that they are fiery plates of gold, resembling pictures.