The Universe, Wrought For Us By A

So If The Worth Of The Arts Were Measured By The Matter With Which They Deal, This Art-which Some Call Astronomy, Others Astrology, And Many Of The Ancients The Consummation Of Mathematics-would Be By Far The Most Outstanding. This Art Which Is As It Were The Head Of All The Liberal Arts And The One Most Worthy Of A Free Man Leans Upon Nearly All The Other Branches Of Mathe Matics. Arithmetic, Geometry, Optics, Geodesy, Mechanics, And Whatever Others, All Offer Themselves In Its Service.

More Stars In The North Are Seen Not To Set, While In The South Certain Stars Are No Longer Seen To Rise.

We Regard It As A Certainty That The Earth, Enclosed Between Poles, Is Bounded By A Spherical Surface.

Mathematics Is Written For Mathematicians.

Accordingly, Since Nothing Prevents The Earth From Moving, I Suggest That We Should Now Consider Also Whether Several Motions Suit It, So That It Can Be Regarded As One Of The Planets. For, It Is Not The Center Of All The Revolutions.