Cicero's metaphor invites us to undertake a fascinating literary and mythological journey, and we should begin by noticing that Cicero is quoting from his own partially-extant Latin translation of the Phenomena, a poem by the third-century Greek didactic poet Aratus:
QuoteThe earliest translation of Aratus in Rome is much better preserved; it was made by Cicero, the most important Roman orator and also a distinguished politician during the time of the civil wars. Cicero also wrote many works on philosophical subjects and some poetry; of his translation of Aratus, which he composed when he was young in ca. 90-89 BCE, only 480 lines (corresponding to Aratus, Phaen. 229-701) are preserved by the manuscript tradition; we also have additional 73 lines (of which 8 are incomplete hexameters) in 34 fragments quoted by Cicero himself in his own other works (esp. De natura deorum).
-Cicero's Aratea, Early Astronomy in the University of Michigan Collections
In the three or four lines of this poem quoted by Cicero in section twenty of Academica book two, he abjures the method of the 'Phoenician Sailor', a somewhat odd thing to do given that Carthage, a Phoenician settlement, was the reigning sea power in the Mediterranean until the Punic wars. Presumably their methods of maritime navigation were good. However, Cicero had already confessed to the following view:
Quote"although I consider to see the truth a most beautiful thing, so also do I think it a most disgraceful one to approve of what is false as if it were true."
He denounces the method of the Phoenicians, perhaps not because it is faulty, but because he cannot prove that it is not faulty, and to err in such a case by staking out a position would be disgraceful. Did it not bother him that (according to Polybius) the Romans did not even have a wartime navy until they discovered and reverse-engineered a Phoenician warship? More on that here.
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Quote"It was, then, because they saw that the war they had undertaken lingered to a weary length, that they first thought of getting a fleet built, consisting of a hundred quinqueremes and twenty triremes. But one part of their undertaking caused them much difficulty. Their shipbuilders were entirely unacquainted with the construction of quinqueremes, because no one in Italy had at that time employed vessels of that description. There could be no more signal proof of the courage, or rather the extraordinary audacity of the Roman enterprise. Not only had they no resources for it of reasonable sufficiency; but without any resources for it at all, and without having ever entertained an idea of naval war,—for it was the first time they had thought of it,—they nevertheless handled the enterprise with such extraordinary audacity, that, without so much as a preliminary trial, they took upon themselves there and then to meet the Carthaginians at sea, on which they had for generations held undisputed supremacy. Proof of what I say, and of their surprising audacity, may be found in this. When they first took in hand to send troops across to Messene they not only had no decked vessels but no war-ships at all, not so much as a single galley: but they borrowed quinqueremes and triremes from Tarentum and Locri, and even from Elea and Neapolis; and having thus collected a fleet, boldly sent their men across upon it. It was on this occasion that, the Carthaginians having put to sea in the Strait to attack them, a decked vessel of theirs charged so furiously that it ran aground, and falling into the hands of the Romans served them as a model on which they constructed their whole fleet. And if this had not happened it is clear that they would have been completely hindered from carrying out their design by want of constructive knowledge."
Now in the poem, the Phoenician is guided by 'The nightly star, which shining not in vain', and this star (in the constellation Cynosura, the dog's tail, or, as we now call it, Ursa Minor, the little bear) must be the North Star, Polaris. Cicero announces that his preference is to take a more expansive view, and navigate by Helice, now Ursa Major, the big bear, and 'the bright north star'; "that is to say, to these reasons of a more expansive kind, not polished away to a point."
To which star is he referring when he says 'the bright north star'? I originally took this to mean Polaris, but now I think he means a star even brighter than Polaris, and one that is to be found in Ursa Major: that star is Alioth.
Setting aside the mythological references, Cicero seems to be saying that it would actually be better to take the area of the circle circumscribed by Alioth as probably containing the reference point for true north, rather than pointing directly to Polaris, which lies not truly north, but which is close enough for navigation.
I think I handled the mythology well enough on the recording, so I won't commit to writing that up just yet.
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QuoteWho can doubt that poetry will revive and lead in a new age, as the star1 in the constellation Harp, which now flames in our zenith, astronomers announce, shall one day be the pole-star for a thousand years?
-Ralph Waldo Emerson, The American Scholar
1 Vega, a star which today passes overhead in the Northern Hemisphere. Due to Earth's axial precession, Vega will be the northern pole star 11,700 years from now, as it was 14,000 years ago.