That It Was Not Unusual For Conquerors And Sovereigns To Reward
Or Punish The Descendants Of Those Who Had Behaved Well Or Ill To
Celebrated Men Who Had Flourished Long Previously, Must Be Well Known To
Those Conversant With Ancient History.
The respect paid to the memory of
Pindar, by the Spartans, and by Alexander the Great, when they conquered
Thebes, is a striking instance of the truth of this observation.
Hipparchus possessed the true spirit of philosophy: having resolved to
devote himself to the study of astronomy, his first general
[principal->principle] was to take nothing for granted; but setting aside
all that had been taught by former astronomers, to begin anew, and examine
and judge for himself: he determined not to admit any results but such as
were grounded either in observations and experiments entirely new, made by
himself or on a new examination of former observations, conducted with the
utmost care and caution. In short, he may justly be regarded as one of the
first philosophers of antiquity who had a slight glimpse of the grand
maxim, which afterwards immortalized Bacon, and which has introduced modern
philosophers to a knowledge of the most secret and most sublime operations
of nature.
One of his first endeavours was, to verify the obliquity of the ecliptic,
as settled by Eratosthenes: he next fixed, as accurately as possible, the
latitude of Alexandria; but it would lead us far from the object of our
work, if we were even briefly to mention his discoveries in the science of
pure astronomy. We must confine ourselves to those parts of his discoveries
which benefitted geography, either directly or indirectly. After having, as
successfully as his means and the state of the science would permit him to
do, fixed the position of the stars, he transferred the method which he had
employed for this purpose to geography: he was the first who determined the
situation of places on the earth, by their latitudes and longitudes, with
any thing like accuracy. The latitude, indeed, of many places had been
fixed before; and the means of doing it were sufficiently simple and
obvious: but with respect to some general and safe mode of ascertaining the
longitudes, the ancient philosophers before Hipparchus, were ignorant of
it. He employed for this purpose the eclipses of the moon. After having
ascertained the latitudes and longitudes of a great many places, he
proposed to draw up a catalogue of terrestial latitudes and longitudes, but
this he was not able to accomplish: he had set the example, however and it
was followed by subsequent astronomers. He fixed on the Fortunate Islands,
which are supposed to be the Canaries, for his first meridian. His
principal works most probably were destroyed in the conflagration of the
Alexandrian library. His catalogue of the stars is preserved in the
Almagest of Ptolemy; and his commentary on Aratus and Eudoxus is still
extant.
Such is a brief sketch of the advantages which geography, as founded on
astronomy, derived from the labours of Hipparchus.
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