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Кла́вдий Птолеме́й — позднеэллинистический астроном, астролог, математик, механик, оптик, теоретик музыки и географ. Жил и работал в Александрии Египетской , где проводил астрономические наблюдения.

Автор классической античной монографии , которая стала итогом развития античной небесной механики и содержала практически полное собрание астрономических знаний Греции и Ближнего Востока того времени. Оставил глубокий след и в других областях знания — в оптике, географии, математике, а также в астрологии. Wikipedia  

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Клавдий Птолемей цитаты

„Сопротивляйся прихотям твоим в молодости, ибо в старости никак не сможешь себя исправить, чтобы от них отвыкнуть.“

Клавдий Птолемей
О старости

„Когда я изучаю скученные перекатывающиеся круги звезд, я не чувствую земли под ногами.“

Клавдий Птолемей

Клавдий Птолемей: Цитаты на английском языке

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

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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.”

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Ptolemy книга 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.”

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Ptolemy книга 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.”

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Ptolemy

Book IV, sec. 7
Tetrabiblos

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

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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.”

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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.”

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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.”

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Ptolemy

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