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.

Nicolaus Copernicus

Therefore, having obtained the opportunity from these sources, I too began to consider the mobility of the earth.

Nicolaus Copernicus

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.

Nicolaus Copernicus

So far as hypotheses are concerned, let no one expect anything certain from astronomy, which cannot furnish it, lest he accept as the truth ideas conceived for another purpose, and depart from this study a greater fool than when he entered it.

Nicolaus Copernicus

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.

Nicolaus Copernicus