That's what I said! I guess you have to say its all the preceding folks theoretical framework leading up to Bessel observations of star parallax and Foucualt's proof of Earth rotation to validate and be interpreted within the theoretical framework that by then had Newton universal laws of gravity and interia to make it all look solid enough.
The following page is
SIDEREUS NUNCIUS
Galileo Galilei
on the Web.
http://www.gmu.edu/departments/fld/CLASSICS/galileo/galileo.sid.html
It has precious and excellent figures along with the Latin text.
