First Of All, We Must Note That

For A Traveler Going From Any Place Toward The North, That Pole Of The Daily Rotation Gradually Climbs Higher, While The Opposite Pole Drops Down An Equal Amount.

In The First Book I Shall Describe All The Positions Of The Spheres, Along With The Motions Which I Attribute To The Earth, So That The Book Will Contain As It Were The General Structure Of The Universe. In The Remaining Books I Relate The Motions Of The Remaining Stars, And All The Spheres, To The Mobility Of The Earth, So That It Can Be Thence Established How Far The Motions And Appearances Of The Remaining Stars And Spheres Can Be Saved, If They Are Referred To The Motions Of The Earth.

In So Many And Such Important Ways, Then, Do The Planets Bear Witness To The Earth's Mobility.

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

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."