1. Citáty
  2. Autori
  3. Klaudios Ptolemaios

Klaudios Ptolemaios citáty

Klaudios Ptolemaios bol grécky geograf, astronóm a astrológ, ktorý pravdepodobne žil a pracoval v egyptskej Alexandrii.

Svojho času zaviedol 48 súhvezdí, ktoré zostavil z najjasnejších viditeľných hviezd, ktoré mu pripomínali určité obrazce postáv, zvierat alebo vecí. Mnohé z jeho súhvezdí sa v modernej astronómii používajú dodnes.

Predstava Ptolemaia bola, že planéta Zem sa nachádza v strede vesmíru. Všetky ďalšie nebeské telesá obiehajú okolo nej po kružnicovej dráhe. Táto predstava o vesmíre vydržala až do stredoveku, keď bola vyvrátená Mikulášom Kopernikom.

Zostavil tiež dielo s názvom Geographia, kde opisuje veľké množstvo starovekých miest a rôznych kmeňov obývajúcich vtedajšie známe oblasti.

Jeho Optika sa zachovala v latinskom preklade stratenej arabskej verzie strateného gréckeho originálu. V tejto knihe Ptolemaios opisuje merania, ktorými overil Euklidov a Herónov zákon o rovnosti uhla dopadu a uhla odrazu. Toto pravidlo aplikoval aj na odraz od zakrivených zrkadiel, ktoré dnes nájdeme v zábavných parkoch. Správne pochopi, že odraz od zakrivených zrkadiel je úplne rovnaký, ako keby šlo o rovinné zrkadlá, ktoré sú v bode odrazu dotykovými rovinami ku skutočnému zrkadlu. Wikipedia  

✵ 100 – 170
Klaudios Ptolemaios fotka
Klaudios Ptolemaios: 8   citátov 0   Páči sa

Klaudios Ptolemaios: Citáty v angličtine

“As material fortune is associated with the properties of the body, so honor belongs to those of the soul.”

Help us translate this quote
Ptolemy

Book IV, sec. 1
Tetrabiblos

“I know that I am mortal by nature and ephemeral, but when I trace at my pleasure the windings to and fro of the heavenly bodies, I no longer touch earth with my feet. I stand in the presence of Zeus himself and take my fill of ambrosia.”

Help us translate this quote
Ptolemy kniha Almagest

In some of the manuscripts, the books begins with this epigram (Owen Gingerich, The Eye of Heaven: Ptolemy, Copernicus, Kepler, American Institute of Physics, 1993, p. 55).
Almagest

“We consider it a good principle to explain the phenomena by the simplest hypothesis possible.”

Help us translate this quote
Ptolemy kniha Almagest

Book III, sec 1 (trans. Gerald J. Toomer)
Almagest

“There are three classes of friendship and enmity, since men are so disposed to one another either by preference or by need or through pleasure and pain.”

Help us translate this quote
Ptolemy

Book IV, sec. 7
Tetrabiblos

“Everything that is hard to attain is easily assailed by the generality of men.”

Help us translate this quote
Ptolemy

Book I, sec. 1
Tetrabiblos

“He left in his Optics, the earliest surviving table of angles of refraction from air to water. …This table, quoted and requoted until modern times, has been admired… A closer glance at it, however, suggests that there was less experimentation involved in it than originally was thought, for the values of the angles of refraction form an arithmetic progression of second order… As in other portions of Greek Science, confidence in mathematics was here greater than that in the evidence of the senses, although the value corresponding to 60° agrees remarkably well with experience.”

Help us translate this quote
Ptolemy

Carl B. Boyer, in The Rainbow: From Myth to Mathematics (1959)

“The length of life takes the leading place among inquiries about events following birth.”

Help us translate this quote
Ptolemy

Book III, sec. 10
Tetrabiblos

“To give here an elaborate account of Pappus would be to create a false impression. His work is only the last convulsive effort of Greek geometry which was now nearly dead and was never effectually revived. It is not so with Ptolemy or Diophantus. The trigonometry of the former is the foundation of a new study which was handed on to other nations indeed but which has thenceforth a continuous history of progress.”

Help us translate this quote
Ptolemy

James Gow, A Short History of Greek Mathematics https://books.google.com/books?id=9d8DAAAAMAAJ (1884) p.308.