Vitruvius
,
De architectura libri decem
,
1567
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ticalis plani officium eſſe meridianas partes a ſeptentrionalibus ſeparare, ideo horologia in eo plano deſeri-
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pta ad meridiem, aut ad ſeptentrioncm uergent. </
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<
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">quemadmodum igitur in deſcribendis horologijs in plano fi-
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nitoris, duas portiones ſeu arcus circulorum quæſiuimus, ut longitudinem, & </
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mur, ita hoc quoque loco in horologijs in plano uerticalis deſcribendis duis circumferentias, & </
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<
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memus, e quibus una Solis altitudinem ſuper id planum ſingulis horis oſtendet, unde umbræ longitudo elicie-
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tur, & </
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<
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rariæ igitur circumferentiæ hoc modo a mobili meridiano trahuntur. </
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<
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xml:space
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">& </
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<
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xml:space
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g d. </
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<
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<
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<
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ticalis & </
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<
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<
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horarias portiones ſecetur, ſatis enim est quarta una, ad id quod uolumus oſtendendum, a ſingulis autem di-
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uiſionibus ad diametrum æquinoctialis ducantur lineæ, quæ ſemidiametrum z e. </
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k l. </
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<
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">Iam uero ut ſciamus arcus horarios ad Solis altitudinem excipiendam ſuper planum uer-
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ticalis, a notis L. </
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<
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<
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meridiani, quæ g z. </
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<
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<
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">atque extremis earum linearum numeri horarum apponendi ſunt,
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qui hic exempli gratia notati ſunt iuxta horas antiquas 11. </
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<
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</
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<
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uel primam horam pertingens, Solis altitudinem ſupra uerticalis planum g c d. </
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<
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mæ horæ. </
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<
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<
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<
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">de reliquis arcubus reliquarũ
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borarum, ex quibus Solis altitudo ſupra uerticalis planum habetur, cum Sol æquinoctialem circulum ambit. </
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quod ſi libeat præter antiquas alias quoque ſpecies horarum deſcribcre, eadem diuiſione uti poteris, quoniam
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omnia horarum genera in æquinoctialem pariter currunt. </
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<
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">Vnde ſi a meridie horas uelis, ubi eſt g. </
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<
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6. </
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<
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<
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