know that there are places where the heat is greater than in either of those just mentioned, for some countries are uninhabitable on account of the heat. And I have heard it stated as a fact, that even when the sun mounts highest, the night in those regions is very dark and quite long. From this you must conclude that where the strength and power of the sun are greater, since it is nearer, it must ascend and decline more slowly; for the night is long in summer when the sun mounts highest, and the day is long in winter when it sinks lowest. Now I shall explain this so clearly that you will understand it fully. Footnote 172: It is evident from this discussion that the author believes in a spherical earth; elsewhere, too, he speaks of the sphere of earth (_jarðarbollr_); see c. lvi. You know that here with us in winter the day and the course of the sun are brief; for so short is the sun’s path that it passes through but a single region of the sky, and then only where the sun has considerable strength. But in many places the sun is not to be seen during a large part of winter, for example in Halogaland,[173] as we have not only heard tell but have often and constantly learned and observed with our own eyes. For we know definitely that from about November 10 to January 10 there never comes a day so bright up north in Vaag or at Andenes[174] in Halogaland but that the stars in the sky are visible at midday as at midnight. And although the days have so much light that the stars cannot be seen, nevertheless, in most of the places that we have mentioned the sun remains invisible till January 23. But after that date the days lengthen and the sun mounts so rapidly, that beginning with April 6 daylight does not disappear before September 17, all the intervening time being one continuous day, for daylight never fails in all that while. From this you may safely conclude that, though the sun is hotter in the southern lands that we spoke of earlier, its course waxes and mounts more slowly where the night, even at mid-summer, is deep and long and dark, and where there is never a time in the whole twelvemonth when day does not fail. But in Halogaland, as I have just said, there is no day in winter and stars are visible at midday when the day should be brightest; later, however, when the days begin to lengthen, they grow so rapidly that early in spring daylight begins to tarry all the night and continues till much of the autumn is past. Footnote 173: Halogaland, the modern _Nordland_, is that part of Norway lying north of the sixty-fifth parallel. Footnote 174: Vaag and Andenes are points in the Lofoten Islands; their latitudes are 68° 12´ 35″ and 69° 18´ 50″ respectively.