"I know that I am mortal by nature and ephemeral, but when I trace at my pleasure the windings to and fro of the heave…"

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

"The length of lifetakes the leading place among inquiries about events following birth."

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

"There are three classes of friendship and enmity, since men are so disposed to one another either by preference or by…"

"Ptolemy's Geography is the only book on cartography to have survived from the classical period and one of the most in…"

"He left in his Optics, the earliest surviving table of angles of refraction from air to water. ...This table, quoted …"

"Ptolemy... against the champions of this or that cosmology of the heavens... had dared to claim that it is legitimate…"

"Claudius Ptolemy's great contribution to astronomy was his famous work the Almagest, which presented formally the ast…"

"To give here an elaborate account of Pappus would be to create a false impression. His work is only the last convulsi…"