“ Mathemata mathematicis scribuntur. ”
To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.
~ Nicolaus Copernicus
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.
Of all things visible, the highest is the heaven of the fixed stars.
The earth together with its surrounding waters must in fact have such a shape as its shadow reveals, for it eclipses the moon with the arc of a perfect circle.
