Giovanni F. Bignami <br/><br/>
The Mystery of the Seven Spheres/ 

 - New York:   Springer, 
<br/><br/><br/>Sphere 0 (or the Earth)<br/>Giovanni F. Bignami<br/><br/>Sphere −1 (or of the Oceans)<br/>Giovanni F. Bignami<br/><br/>Sphere −2 (or of the Nether World)<br/>Giovanni F. Bignami<br/><br/>Sphere +1 (or of the Sky)<br/>Giovanni F. Bignami<br/><br/>Sphere +2 (or the Moon)<br/>Giovanni F. Bignami<br/><br/>Mars, Planets, Stars<br/><br/><br/>Sphere +3 Inner (or of the Mars)<br/>Giovanni F. Bignami<br/><br/>Sphere +3 Outer (or the Solar System)<br/>Giovanni F. Bignami<br/><br/>The Sphere +4 (or the Fixed Stars)<br/>Giovanni F. Bignami<br/> 
<br/><br/><label>ISBN: </label>978-3-319-17004-6