3. We will let pass the rest of his distances, since they are something near,—but that the Dnieper is under the same parallel as Thule, what man in his senses could ever agree to this? Pytheas, who has given us the history of Thule, is known to be a man upon whom no reliance can be placed, and other writers who have seen Britain and Ierne,[449] although they tell us of many small islands round Britain, make no mention whatever of Thule. The length of Britain itself is nearly the same as that of Keltica,[450] opposite to which it extends. Altogether it is not more than 5000 stadia in length, its outermost points corresponding to those of the opposite continent. In fact the extreme points of the two countries lie opposite to each other, the eastern extremity to the eastern, and the western to the western: the eastern points are situated so close as to be within sight of each other, both at Kent and at the mouths of the Rhine. But Pytheas tells us that the island [of Britain] is more than 20,000 stadia in length, and that Kent is some days’ sail from France. With regard to the locality of the Ostimii, and the countries beyond the Rhine,[451] as far as Scythia, he is altogether mistaken. The veracity of a writer who has been thus false in describing countries with which we are well acquainted, should not be too much trusted in regard to unknown places. 4. Further, Hipparchus and many others are of opinion that the parallel of latitude of the Dnieper does not differ from that of Britain; since that of Byzantium and Marseilles are the same. The degree of shadow from the gnomon which Pytheas states he observed at Marseilles being exactly equal to that which Hipparchus says he found at Byzantium; the periods of observation being in both cases similar.[452] Now from Marseilles to the centre of Britain is not more than 5000 stadia; and if from the centre of Britain we advance north not more than 4000 stadia, we arrive at a temperature in which it is scarcely possible to exist. Such indeed is that of Ierne.[453] Consequently the far region in which Eratosthenes places Thule must be totally uninhabitable. By what guesswork he arrived at the conclusion that between the latitude of Thule and the Dnieper there was a distance of 11,500 stadia I am unable to divine.