“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.”

“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.”

“In so many and such important ways, then, do the planets bear witness to the earth's mobility.”

“For it is the duty of an astronomer to compose the history of the celestial motions through careful and expert study.”

“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.”

“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...”

“Truth is like the sun. You can shut it out for a time, but it ain't going away.”

“I'm trying to remember how you tell the time by looking at the sun." -"I should leave it for a while, it's too bright to see the numbers at the moment.”

“The sun burnt every day. It burnt time.”