Nicolaus Copernicus — "I consider it the chief duty of an astronomer to gather the observations of the …"
I consider it the chief duty of an astronomer to gather the observations of the heavenly bodies, and to explain their motions by hypotheses.
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More from Nicolaus Copernicus
"For it is the work of a good mathematician to compute the motions of the heavenly bodies, and to predict their positions at any given time."
"Therefore, I propose that the earth moves, and that the fixed stars are immovable."
"Therefore, if any motions are attributed to the earth, they must produce in the celestial phenomena an appearance exactly the reverse of that which is observed."
"The world is spherical; whether it is finite or infinite is an open question."
"Thus, the sun, although it is the center of the world, is not the center of the universe."