4) Now here's a question. The Telmarines had stayed away from the sea, forbade the study of navigation, and knew so little that the seven lords had to travel in a Galmian ship manned with Galmian sailors. Yet within three years of Caspian's accession to the throne, he was able to find a Narnian captain who talks as if he has spent his whole life on the sea. Where did Drinian get his maritime experience? And, indeed, why?
5) Here's another question too. In which direction do the Narnian stars move across the sky? It cannot be east to west, as on Earth, because then the constellations visible in the Eastern Sea would be familiar in Narnia, which they aren't. It is clear that the stars do move, since Lewis notes that the stars had changed position during the night that the travellers sat at Aslan's Table. Moreover, the constellations also change through the year, as it is noted in PC ch 9 that the Ship, Hammer and Leopard are summer constellations. Therefore, I assume that the Narnian stars must move across the sky from north to south (or from south to north) night by night, but also that (as on earth) the stars move slightly faster or slower than the sun, so that over the course of the year the constellations change. Moreover, though the stars move on the north-south line, the sun still crosses the sky from east to west each day.
Another alternative is that the stars do not move in a circular orbit at all, but instead do a kind of dance, which is repeated night by night and year by year so that their positions are predictable (and thereby usable for navigation), but not in regular circular motions as in our world.
Addendum: I've just seen that Ramandu also says that Coriakin had been a star of the southern winter sky, which seems to rule out the south-north rotation hypothesis...
6) According to Ramandu's daughter, the three sleeping lords arrived with others, sailors. So what happened to them? And if they returned to the west, why did no-one know anything about what lay to the east?
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