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" Moreover, since the sun remains stationary, whatever appears as a motion of the sun is really due rather to the motion of the earth. "
Nicolaus Copernicus
Sun
Whatever
Motion
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" Those who know that the consensus of many centuries has sanctioned the conception that the earth remains at rest in the middle of the heavens as its center, would, I reflected, regard it as an insane pronouncement if I made the opposite assertion that the earth moves. "
Nicolaus Copernicus
Who
Rest
Earth
" Not a few other very eminent and scholarly men made the same request, urging that I should no longer through fear refuse to give out my work for the common benefit of students of Mathematics. "
Nicolaus Copernicus
Men
Fear
Mathematics
" Pouring forth its seas everywhere, then, the ocean envelops the earth and fills its deeper chasms. "
Nicolaus Copernicus
Deeper
Ocean
Everywhere
" Near the sun is the center of the universe. "
Nicolaus Copernicus
Sun
Universe
Center
" We regard it as a certainty that the earth, enclosed between poles, is bounded by a spherical surface. "
Nicolaus Copernicus
Earth
Between
Certainty
" 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
Fool
Far
Accept
" 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
Know
True Knowledge
Knowledge
" For I am not so enamoured of my own opinions that I disregard what others may think of them. "
Nicolaus Copernicus
Opinions
I Am
My Own
" At rest, however, in the middle of everything is the sun. "
Nicolaus Copernicus
Everything
Middle
Sun
" In so many and such important ways, then, do the planets bear witness to the earth's mobility. "
Nicolaus Copernicus
Earth
Bear
Important
" The earth also is spherical, since it presses upon its center from every direction. "
Nicolaus Copernicus
Earth
Since
Center
" Mathematics is written for mathematicians. "
Nicolaus Copernicus
Mathematics
Mathematicians
Written
" 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. "
Nicolaus Copernicus
Judgment
I Am
God
" Yet if anyone believes that the earth rotates, surely he will hold that its motion is natural, not violent. "
Nicolaus Copernicus
Motion
Will
Natural
" Therefore I would not have it unknown to Your Holiness, the the only thing which induced me to look for another way of reckoning the movements of the heavenly bodies was that I knew that mathematicians by no means agree in their investigation thereof. "
Nicolaus Copernicus
Me
Mathematicians
Look
" Therefore, when I considered this carefully, the contempt which I had to fear because of the novelty and apparent absurdity of my view, nearly induced me to abandon utterly the work I had begun. "
Nicolaus Copernicus
Absurdity
Work
View
" 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
Mind
Since
Recall
" First of all, we must note that the universe is spherical. "
Nicolaus Copernicus
Note
Universe
Must
" I can easily conceive, most Holy Father, that as soon as some people learn that in this book which I have written concerning the revolutions of the heavenly bodies, I ascribe certain motions to the Earth, they will cry out at once that I and my theory should be rejected. "
Nicolaus Copernicus
Earth
People
Learn
" 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. "
Nicolaus Copernicus
Shadow
Perfect
Moon
" Although all the good arts serve to draw man's mind away from vices and lead it toward better things, this function can be more fully performed by this art, which also provides extraordinary intellectual pleasure. "
Nicolaus Copernicus
Better
Art
Arts
" 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
Daily
Place
Going
" Therefore, in the course of the work I have followed this plan: I describe in the first book all the positions of the orbits together with the movements which I ascribe to the Earth, in order that this book might contain, as it were, the general scheme of the universe. "
Nicolaus Copernicus
Together
Work
Earth
" 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
Hope
Long
Me
" Of all things visible, the highest is the heaven of the fixed stars. "
Nicolaus Copernicus
Stars
Things
Inspirational
" 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. "
Nicolaus Copernicus
Suit
Moving
Earth
" Therefore, having obtained the opportunity from these sources, I too began to consider the mobility of the earth. "
Nicolaus Copernicus
Mobility
Opportunity
Sources
" The massive bulk of the earth does indeed shrink to insignificance in comparison with the size of the heavens. "
Nicolaus Copernicus
Comparison
Size
Shrink
" For it is the duty of an astronomer to compose the history of the celestial motions through careful and expert study. "
Nicolaus Copernicus
Through
History
Expert
" Those things which I am saying now may be obscure, yet they will be made clearer in their proper place. "
Nicolaus Copernicus
Obscure
Now
I Am