Of All Things Visible, The Highest Is

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

In The Midst Of All Dwells The Sun.

I Am Aware That A Philosopher's Ideas Are Not Subject To The Judgment Of Ordinary Persons, Because It Is His Endeavour To Seek The Truth In All Things, To The Extent Permitted To Human Reason By God.

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

Yet The Widespread Planetary Theories, Advanced By Ptolemy And Most Other Astronomers, Although Consistent With The Numerical Data, Seemed Likewise To Present No Small Difficulty. For These Theories Were Not Adequate Unless They Also Conceived Certain Equalizing Circles, Which Made The Planet Appear To Move At All Times With Uniform Velocity Neither On Its Deferent Sphere Nor About Its Own Epicycle's Center.