Those who study the stars have God for a teacher..

For those [observations] that I made in Leipzig in my youth and up to my 21st year, I usually call childish and of doubtful value. Those that I took ….

The star [Tycho's supernova] was at first like Venus and Jupiter, giving pleasing effects; but as it then became like Mars, there will next come a pe….

Behold, directly overhead, a certain strange star was suddenly seen . . . Amazed, and as if astonished and stupified, I stood still.

From his observations, he concluded that it [Tycho's supernova] was not some kind of comet or a fiery meteor, whether these be generated beneath the ….

May I not seem to have lived in vain..

An astronomer must be cosmopolitan, because ignorant statesmen cannot be expected to value their services.

And when statesmen or others worry him [the scientist] too much, then he should leave with his possessions. With a firm and steadfast mind one should….

When I had satisfied myself that no star of that kind had ever shone before, I was led into such perplexity by the unbelievability of the thing that ….

So mathematical truth prefers simple words since the language of truth is itself simple..

Now it is quite clear to me that there are no solid spheres in the heavens, and those that have been devised by the authors to save the appearances, ….

And when statesman or others worry [the scientist] too much, then he should leave with his possessions..

It was not just the Church that resisted the heliocentrism of Copernicus..

The mouse is wise, but the cat is wiser..

That the machine of Heaven is not a hard and impervious body full of various real spheres, as up to now has been believed by most people. It will be ….

When, according to habit, I was contemplating the stars in a clear sky, I noticed a new and unusual star, surpassing the other stars in brilliancy . ….

There is something eccentric in the orbit of Mars..

Because the region of the Celestial World is of so great and such incredible magnitude as aforesaid, and since in what has gone before it was at leas….

The body of the Earth, large, sluggish and inapt for motion, is not to be disturbed by movement (especially three movements), any more than the Aethe….