Note 543 — Chapter I
W. (William) Falconer translation
Small zones parallel to the equator; they were placed at such a distance from each other, that there might be half an hour’s difference between each on the longest day of summer. So by taking an observation on the longest day, you could determine the clima and consequently the position of a place. This was equivalent to observing the elevation of the pole. At the end of this second book Strabo enters into a long description of the climata.