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Updated: June 11, 2025
He was killed by Roman soldiers when Syracuse was taken; and the Sicilians so soon forgot his greatness that in the time of Cicero they did not know where his tomb was. Eratosthenes was another of the famous geometers of antiquity, and did much to improve geometrical analysis. He was also a philosopher and geographer.
Eratosthenes, Archimedes, and Hipparchus were geniuses worthy to be placed by the side of Kepler, Newton, and La Place. And all ages will reverence their efforts and their memory. It is truly surprising that, with their imperfect instruments, and the absence of definite data, they reached a height so sublime and grand.
The mountains equal to Mont Blanc are Moret, Theophylus, and Catharnia; to Mount Rosa, Piccolomini, Werner, and Harpalus; to Mount Cervin, Macrobus, Eratosthenes, Albateque, and Delambre; to the Peak of Teneriffe, Bacon, Cysatus, Philolaus, and the Alps; to Mount Perdu, in the Pyrenees, Roemer and Boguslawski; to Etna, Hercules, Atlas, and Furnerius.
"Why so, if the weight on the surface of the moon is six times less than upon the surface of the earth?" said Michel. "But if the Selenites are six times smaller?" replied Nicholl. "And if there are no Selenites?" added Barbicane, which terminated the discussion. Eratosthenes soon disappeared from the horizon without the projectile having been sufficiently near it to allow a rigorous observation.
So that it is necessary to be exceedingly indignant that Pheido, having been chosen to conciliate you and restore you, did the same things as Eratosthenes, and with the same mind was ready to injure those who were in the majority in their own party by means of you; and he was not willing to restore the city to you in unjust exile, but, having come to Sparta, he tried to persuade them to begin hostilities, falsely saying that the city would fall into the power of the Boeotians, and other things besides by which he hoped to persuade them. 59.
He is in the Ethical Branch the Counterpart of Aristotle in the Physical. Its Effect on the rapid Development of exact Knowledge. Influence of Euclid, Archimedes, Eratosthenes, Apollonius, Ptolemy, Hipparchus, on Geometry, Natural Philosophy, Astronomy, Chronology, Geography. Decline of the Greek Age of Reason.
Posidonius constructed an orrery, which exhibited the diurnal motions of the sun, moon, and five planets. Posidonius calculated the circumference of the earth to be two hundred and forty thousand stadia by a different method from Eratosthenes.
This opinion regarding Eratosthenes, that he was more of a geometrician than a geographer, seems to be confirmed by the testimony of Marcian of Heraclia, who informs us, that Eratosthenes took the whole work of Timosthenes, preface and all, as it stood, and in the very same words.
The first mention of any preparation, by which the juice of the reed was thickened, occurs in Eratosthenes, as quoted by Strabo, where he describes roots of large reeds found in India, which were sweet to the taste, both when raw and boiled. Dioscorides and Pliny describe it as used chiefly, if not entirely, for medical purposes.
Where Aristarchus halted, however, another worker of the same period took the task in hand and by an altogether wonderful measurement determined the size of the earth, and thus brought the scientific theories of cosmology to their climax. This worthy supplementor of the work of Aristarchus was Eratosthenes of Alexandria.
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