Mathemata Mathematicis Scribuntur Mathematics Is Written For

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.

Among The Authorities It Is Generally Agreed That The Earth Is At Rest In The Middle Of The Universe, And They Regard It As Inconceivable And Even Ridiculous To Hold The Opposite Opinion. However, If We Consider It More Closely The Question Will Be Seen To Be Still Unsettled, And So Decidedly Not To Be Despised. For Every Apparent Change In Respect Of Position Is Due To Motion Of The Object Observed, Or Of The Observer, Or Indeed To An Unequal Change Of Both.

For When A Ship Is Floating Calmly Along, The Sailors See Its Motion Mirrored In Everything Outside, While On The Other Hand They Suppose That They Are Stationary, Together With Everything On Board. In The Same Way, The Motion Of The Earth Can Unquestionably Produce The Impression That The Entire Universe Is Rotating.

I Shall Now Recall To Mind That The Motion Of The Heavenly Bodies Is Circular, Since The Motion Appropriate To A Sphere Is Rotation In A Circle.

For It Is The Duty Of An Astronomer To Compose The History Of The Celestial Motions Through Careful And Expert Study.