We have said earlier that in winter the sun’s course here is short, but of such extraordinary length in summer that we then have day nearly all the time. From this you may conclude that the sun’s path is quite broad and that its course is not narrow and straight as if it were always following a certain line. As soon as it reaches the outer edge of its sloping circuit toward the south, those who live on the extreme side of the world to the south have summer and long sun paths, while we have winter and little sunlight. And when the sun comes to the extreme edge of its circuit to the north, we have long-continued sunshine, while they have cold winter. For it is always this way, that the sun rises higher in the north when its path declines in the south: and when its course begins to decline in the north, it begins to wax on the southern side. You should also know that the change from day to night is due to the movements of the sun. For some places have midday when others have midnight; and the day dawns and brightens in some places just when darkness begins and night falls in other places.[234] For the day and the light always follow the sun, while the shadows flee from it; still they follow after it as it moves away; and there is always night where the shadows are, but always day where the light is. Now if you understand all these things that we have discussed in these hours, the change in day and night, the course of the sun, and all the other matters that we have talked about, you may count yourself thoroughly prepared for the trader’s calling, inasmuch as few only have had more instruction in these subjects than you have had. Footnote 234: Cf. Capella, _Satiricon_, 204. ------------------------------------------------------------------------ XXII THE WINDS WITH RESPECT TO NAVIGATION _Son._ I should indeed consider it highly informing, if I could remember all the things that you have now told me. I gather from your remarks, however, that you seem to think that I have asked about too many things in these our talks. But if you are not wearied with my questions, there still remains a little matter which, with your permission, I should like to ask about, one that also seems to belong to the knowledge of seafarers.