Johannes Kepler's (1571-1630) most influential work in introducing the heliocentric theory to a broad audience was his *Epitome Astronomia Copernicanae* [*Epitome of* *Copernican Astronomy*], published in the years 1618-1621. This work comprises three volumes and contains seven books: Volume I contains three books, Volume II contains Book Four, and Volume III contains the remaining three books. Here is the title page from Volume I of the 1635 edition. The first three books are devoted to the “Doctrine of the Sphere.”

Pages 278 and 279 of Kepler’s *Epitome*. The diagram on page 279 illustrates the rotation of the Earth about the Sun. Note the text above the diagram telling the reader, “Solis S immobile”—the Sun does not move.