Clavius, Christoph
,
Gnomonices libri octo, in quibus non solum horologiorum solariu[m], sed aliarum quo[quam] rerum, quae ex gnomonis umbra cognosci possunt, descriptiones geometricè demonstrantur
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ſtylus I K, ad angulos rectos cadit. </
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I A, dato gnomoni æqualis, ſiue is maior exiſtat ſtylo I K, ſiue minor, & </
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<
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">per A, ipſi ρ G, parallela
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agatur B D, erit triangulum B I D, triangulo ρ I G, ſimile. </
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<
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xml:space
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">Quare ſi axis I B, transferatur in figu-
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ram radiorum ex ρ, vſque ad B, verſus I, atque ex B, egrediantur radij ſignorum, & </
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<
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">reliqua omnia
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fiant, vt in præcedentibus expoſitum eſt, deſcribentur arcus ſignorum pro magnitudine ſtyli
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I A, &</
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<
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">HOROLOGIVM Italicum & </
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@ologii Italici
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& Babylonici
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declinantis, &
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ſimul inclinati.</
note
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Nam ſi circulus ex L, deſcriptus ſecetur in arcum diurnum ♋, a M b, & </
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<
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">in arcum diurnum ♑,
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d M e, ita vt rectæ a b, d e, ſecent rectam L M, quæ per centrum L, meridianæ lineæ parallela du-
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citur, ad angulos rectos, hoc eſt, arcus ſemidiurni à puncto M, numerentur vſque ad puncta a, b,
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d, e, diuiſioq́ue eiuſdem circuli in 24. </
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<
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">partes æquales initium ſumat à punctis occidentalibus b, e,
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pro horologio Italico, & </
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">à punctis orientalibus a, d, pro Babylonico, inueniemus in tropicis pun-
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cta horarum ab or. </
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">Sed quoniam in noſtro exemplo tropicus ♑, de-
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ſcribi non poteſt, ſatis erit, ſi inueniantur puncta horarum ab or. </
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<
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<
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">in tropico ♋, beneficio ar-
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cus diurni a M b, eiuſdem tropici. </
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">Hæc enim lineis rectis coniuncta cum horis reſpondentibus
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in linea æquinoctiali, vt in præcedentibus, dabunt horas ab or. </
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<
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periori horologio noſtri exempli, hoc eſt, in portione infra horizontalem lineam contenta, pun-
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cta duntaxat horarum ab occ. </
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<
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