Frasi di Giovanni Keplero

Giovanni Keplero foto
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Giovanni Keplero

Data di nascita: 27. Dicembre 1571
Data di morte: 15. Novembre 1630

Pubblicità

Giovanni Keplero fu un astronomo, matematico, musicista e teologo evangelico tedesco, che scoprì empiricamente le omonime leggi che regolano il movimento dei pianeti.

Frasi Giovanni Keplero

Pubblicità
Pubblicità

„I much prefer the sharpest criticism of a single intelligent man to the thoughtless approval of the masses.“

— Johannes Kepler
As quoted in (K)new Words: Redefine Your Communication (2005) by Gloria Pierre, p. 147

„If you want the exact moment in time, it was conceived mentally on 8th March in this year one thousand six hundred and eighteen, but submitted to calculation in an unlucky way, and therefore rejected as false, and finally returning on the 15th of May and adopting a new line of attack, stormed the darkness of my mind.“

— Johannes Kepler
Context: If you want the exact moment in time, it was conceived mentally on 8th March in this year one thousand six hundred and eighteen, but submitted to calculation in an unlucky way, and therefore rejected as false, and finally returning on the 15th of May and adopting a new line of attack, stormed the darkness of my mind. So strong was the support from the combination of my labour of seventeen years on the observations of Brahe and the present study, which conspired together, that at first I believed I was dreaming, and assuming my conclusion among my basic premises. But it is absolutely certain and exact that "the proportion between the periodic times of any two planets is precisely the sesquialterate proportion of their mean distances..." Book V, Ch. 3 dates that his Third Law of Planetary Motion occurred to him, translation by E. J. Aiton, A. M. Duncan, and J. V. Field, The Harmony of the World (1997), Vol. 209, p. 411 Variant translation: A fresh assault overcame the darkness of my reason... As quoted in Calculus. Multivariable (2006) by Steven G. Krantz and Brian E. Blank. p. 126

Pubblicità

„Of a number of variant hypotheses about the same facts, that one is true which shows why facts, which in the other hypotheses remain unrelated, are as they are, i.e., which demonstrates their orderly and rational mathematical connexion.“

— Johannes Kepler
Context: Of a number of variant hypotheses about the same facts, that one is true which shows why facts, which in the other hypotheses remain unrelated, are as they are, i. e., which demonstrates their orderly and rational mathematical connexion. Vol. I, p. 238

„I contemplate its beauty with incredible and ravishing delight“

— Johannes Kepler
Context: I certainly know that I owe it [the Copernican theory] this duty, that as I have attested it as true in my deepest soul, and as I contemplate its beauty with incredible and ravishing delight, I should also publicly defend it to my readers with all the force at my command. Vol. VI, p. 116, Vol. VIII, p. 266ff.

„Given ships or sails adapted to the breezes of heaven, there will be those who will not shrink from even that vast expanse.“

— Johannes Kepler
Context: It is not improbable, I must point out, that there are inhabitants not only on the moon but on Jupiter too, or (as was delightfully remarked at a recent gathering of certain philosophers) that those areas are now being unveiled for the first time. But as soon as somebody demonstrates the art of flying, settlers from our species of man will not be lacking. Who would once have thought that the crossing of the wide ocean was calmer and safer than of the narrow Adriatic Sea, Baltic Sea, or English Channel? Given ships or sails adapted to the breezes of heaven, there will be those who will not shrink from even that vast expanse. Therefore, for the sake of those who, as it were, will presently be on hand to attempt this voyage, let us establish the astronomy, Galileo, you of Jupiter, and me of the moon. Translated by Edward Rosen, Kepler's Conversation with Galileo's Sidereal Messenger (1965), p. 39 Unsourced variant translation: Provide ships or sails fit for the winds of heaven, and some will brave even that great void.

„Nothing which consists of corporeal matter is absolutely light, but that is comparatively lighter which is rarer“

— Johannes Kepler
Context: Nothing which consists of corporeal matter is absolutely light, but that is comparatively lighter which is rarer, either by its own nature, or by accidental heat. And it is not to be thought that light bodies are escaping to the surface of the universe while they are carried upwards, or that they are not attracted by the earth. They are attracted, but in a less degree, and so are driven outwards by the heavy bodies; which being done, they stop, and are kept by the earth in their own place. As quoted by Bryant, ibid.

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