Those things which I am saying now may be obscure, yet they will be made clearer in their proper place.

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• Nicolaus Copernicus:

  Therefore, in the course of the work I have followed this plan: I describe in the first book all th

• Nicolaus Copernicus:

  For it is the duty of an astronomer to compose the history of the celestial motions through careful

• Nicolaus Copernicus:

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

• Nicolaus Copernicus:

  Although all the good arts serve to draw man's mind away from vices and lead it toward better thing

• Nicolaus Copernicus:

  First of all, we must note that the universe is spherical.

• Nicolaus Copernicus:

  The earth also is spherical, since it presses upon its center from every direction.

• Nicolaus Copernicus:

  For a traveler going from any place toward the north, that pole of the daily rotation gradually cli

• Nicolaus Copernicus:

  More stars in the north are seen not to set, while in the south certain stars are no longer seen to

• Nicolaus Copernicus:

  Pouring forth its seas everywhere, then, the ocean envelops the earth and fills its deeper chasms.

• Nicolaus Copernicus:

  The earth together with its surrounding waters must in fact have such a shape as its shadow reveals