Note 1115 — Chapter X · THE ASTRONOMICAL GEOGRAPHY OF THE KNOWN WORLD

The boundaries of Al-Farghānī’s and John of Holywood’s climates are one parallel south of those indicated in the various works referred to in note 17, p. 453, above, and those of the Toledo Tables; that is to say, the centers of the former are at the parallels of the northern borders of the latter (see Fig. 11, col. VII). According to Al-Khwārizmī, the figures for the parallels bounding the climates appear to have been derived from the Almagest; Al-Khwārizmī’s second climate, however, corresponds to the first climate of Agathodaemon’s map and of the other works derived from Ptolemy (see above, p. 453, note 17, and Fig. 11, cols. III-VI). The third climate of Al-Khwārizmī corresponds to the second climate in the works derived from Ptolemy, and so on. See Fischer, op. cit., p. 92, and footnotes 1 and 2. See Figure 11, col. VIII.