At Rest, However, In The Middle Of

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.

First Of All, We Must Note That The Universe Is Spherical.

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

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.

For I Am Not So Enamoured Of My Own Opinions That I Disregard What Others May Think Of Them.