First Of All, We Must Note That

In First Place We Must Observe That The Universe Is Spherical. This Is Either Because That Figure Is The Most Perfect, As Not Being Articulated, But Whole And Complete In Itself; Or Because It Is The Most Capacious And Therefore Best Suited For That Which Is To Contain And Preserve All Things.

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

I Therefore Took This Opportunity And Also Began To Consider The Possibility That The Earth Moved. Although It Seemed An Absurd Opinion, Nevertheless, Because I Knew That Others Before Me Had Been Granted The Liberty Of Imagining Whatever Circles They Wished To Represent The Phenomena Of The Stars, I Thought That I Likewise Would Readily Be Allowed To Test Whether, By Assuming Some Motion Of The Earth's, More Dependable Representations Than Theirs Could Be Found For The Revolutions Of The Heavenly Spheres.

The Massive Bulk Of The Earth Does Indeed Shrink To Insignificance In Comparison With The Size Of The Heavens.

Although All The Good Arts Serve To Draw Man's Mind Away From Vices And Lead It Toward Better Things, This Function Can Be More Fully Performed By This Art, Which Also Provides Extraordinary Intellectual Pleasure.