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Through Thule
"Ptolemy did not discuss the eighth climate because that part of the earth was unknown to him but was explored by later scholars. It is called Dia Tyles because the beginning of the climate located on the twenty-first parallel from the equator passes directly through Thule. [legendary island variously identified as Greenland, Iceland, Shetland or part of Norway]." (Cosmographiae introductio, chap. VII - Hessler 2008)