Terrestrial and Celestial Globes Volume 1: Their History and Construction Including a Consideration of their Value as Aids in the Study of Geography and AstronomyStevenson, Edward Luther
History
Terrestrial and Celestial Globes Volume 1: Their History and Construction Including a Consideration of their Value as Aids in the Study of Geography and Astronomy
Stevenson, Edward Luther
Geography -- History; Globes
We learn from Cicero and from other early writers that Archimedes (ca.
287-212 B. C.), the celebrated geometrician of Syracuse, constructed a
globe or contrivance for the purpose of demonstrating the movements of
the heavenly bodies. Cicero’s statements imply that the work of
Archimedes was well known in his day, yet he thought it merited a
special word of commendation from himself. “I shall propose nothing new
to you,” he says, “nor that which I have invented or discovered; but I
remember C. Sulpicius Gallus, a very learned man, as you know, when this
appearance (in the heavens) was spoken of, and he was, by chance, at
the house of Marcellus, who had been consul with him, he described a
globe among the spoils of that opulent and magnificent city of Syracuse,
when captured, as the only thing among all the spoils which he ordered
to be carried to his own house; about which globe I have often heard, on
account of the fame of Archimedes, although the work itself was not very
remarkable, for there was another far more beautiful and more honored by
the common people, made by the same Archimedes, and placed in the Temple
of Virtue by the same Marcellus. But afterward when Gallus began to
explain scientifically the object of the machine, I thought there was
more ingenuity in that Sicilian than human nature was capable of. For
Gallus informed me that there was another ancient invention of a solid
and elaborately formed globe which was made by Thales, the Milesian, to
revolve. And afterward the same was, by Eudoxus of Cnidos, the disciple
of Plato, adorned with the fixed stars of heaven, and with every
ornament and embellishment, as described by Eudoxus, and was many years
afterward celebrated by Aratus, not exactly in the scientific language
of astronomy, but with the graces of poetry. This species of globe
indeed, in which the sun and moon were made to revolve, and five of
those stars which have been called travelers, and as it were wanderers,
could not possibly be exhibited on that solid sphere. And more
especially was that invention of Archimedes to be admired, for he had so
contrived that one revolution of the machine served somehow to produce
unequal and varied movements through their different paths. For when
Gallus set the globe in motion, the moon succeeded the sun by as many
turns of the brass wheel of the machine as days in the heavens, so that
the globe represented in the heavens the same eclipse of the sun, when
the moon arrived at a certain place or point, as the shadow of the earth
did when the sun shone from the opposite region.”[34]
Public-domain text, read in full here on John Shaqi.
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