PAL

Ptolemaeus Arabus et Latinus

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Federico Commandino, In Planisphaerium Ptolemaei commentarius

Venice, Paulus Manutius Aldi, 1558 · 15r

Facsimile

GM; GM] read GN ductaque EH et producta usque ad lineam GK in punctum P, per P ducatur OPQ aequidistans ipsi T〈G〉U et a punctis T U ducantur ipsae TO, UQ perpendiculares ad eandem et postremo iungantur LO, MQ. Dico superficiem ABCD in tabula apparere

velut est ipsa LOQM. Ductis enim EBR, ECS lineis similiter atque in superioribus, ostendemus lineam RS communem, videlicet sectionem tabulae et trianguli RES, aequidistantem esse lineae AD et OP, aequalem ipsi PR et PQ, ipsi PS. Quare, si manente linea GP superficies LOQM circumducatur quousque linea GL transeat ad ipsam GA, transibit et L punctum ad punctum A, M ad D, O ad R et Q ad S, et videbitur superficies ABCD in tabula qualis est ipsa LOQM ut proponebatur. Et eodem modo in aliis procedemus.