dioi.orgdioi.org/dukunre.pdfwas known, although use infrequently, at least by Ptolemy. This skill...
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dioi.orgdioi.org/dukunre.pdfwas known, although use infrequently, at least by Ptolemy. This skill was fully developed by the time Ptolemy wrote the Almagest, ca 150 CE (Toomer 1980),