I Can Easily Conceive, Most Holy Father,

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.

Finally We Shall Place The Sun Himself At The Center Of The Universe. All This Is Suggested By The System Of Procession Of Events And The Harmony Of The Whole Universe, If Only We Face The Facts, As They Say, "with Eyes Wide Open."

Mathematics Is Written For Mathematicians.

So, Influenced By These Advisors And This Hope, I Have At Length Allowed My Friends To Publish The Work, As They Had Long Besought Me To Do.

The Two Revolutions, I Mean The Annual Revolutions Of The Declination And Of The Centre Of The Earth, Are Not Completely Equal; That Is The Return Of The Declination To Its Original Value Is Slightly Ahead Of The Period Of The Centre. Hence It Necessarily Follows That The Equinoxes And Solstices Seem To Anticipate Their Timing, Not Because The Sphere Of The Fixed Stars Moves To The East, But Rather The Equatorial Circle Moves To The West, Being At An Angle To The Plane Of The Ecliptic In Proportion To The Declination Of The Axis Of The Terrestrial Globe.