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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LIBER TERTIVS.
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<
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xml:space
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xml:space
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">Aſcẽdentia ſi-
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gna quo pacto
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in eodem horo
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logio depingan
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tur.</
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tia ſigna, ut ex appoſita figura perſpicuum fiet. </
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<
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xml:space
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<
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</
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<
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xml:space
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">indagabimus in linea æquinoctiali puncta, per quæ lineæ ♈, ♉, ♊, ♋, ♎, ♏, ♒, & </
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Ex tertia autem tabella eiuſdem propoſ. </
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<
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<
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Pro ♏, autem ♒, & </
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<
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">♓, puncta inueniemus in linea meridiana ex tabella ſexta eiuſdem propoſ.
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Deinde pro ♌, reperiemus punctum in tropico ♋, ex tertia tabella eiuſdẽ propoſ. </
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<
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ximus lineam ♌, trãſeuntem per punctum illud horizõtalis lineæ, ubi à parallelo ♊, & </
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<
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tur. </
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<
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xml:space
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alterum in meridiana linea ex ſexta tabella propoſ. </
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<
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">Lineæ autem ♐, & </
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exemplo deſcribi poſſunt, cum nimis procul excurrãt, vt ex dictis tabellis facile colligi poteſt. </
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<
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ſibũtautem omnes lineæ aſcendentium ſignorum per puncta lineæ horizontalis, vbi eam arcus ſi-
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gnorum ſecant, quæ quidem puncta ſine dictis arcubus inueſtigari etiam poſſunt vel ex tabella
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quinta propoſ. </
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<
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<
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<
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">vt ex ſuperioribus patet, vel ex figura latitudinum ortiuarum, occidua-
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rumve propoſ. </
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<
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<
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ctorum, per quę
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aſcendentia ſi-
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gna ducuntur
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in linea hori-
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zontali.</
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<
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">IN figura latitudinum ortiuarum, & </
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">occiduarum, quam in propoſ. </
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<
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conſtituatur B E G, angulus declinationis plani propoſiti à Verticali circulo, ad partes quidẽ me-
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ridiei uerſus occaſum, ſi planum à ſeptentrionem in ortum declinet, vt in dato exemplo contin-
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git, vel verſus ortum, ſi in occaſum uergat: </
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<
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">at uerò ad partes ſeptentrionis verſus ortum, ſi horo-
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logium deflectat à meridie in occaſum, vel verſus occaſum, ſi uergat à meridie in ortũ. </
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<
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accipiatur recta E G, ęqualis rectę A B, in figura propoſ. </
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<
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<
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">per G, ad E G, perpendi
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cularis excitetur G H. </
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<
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">Si enim puncta huius perpendicularis, vbi à radiis latitudinũ ortiuarũ ſe-
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catur, ex puncto H, accepta trãsferantur in lineam horizontalẽ ex puncto F, vbi meridiana linea,
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& </
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<
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">horizontalis ſe mutuo interſecãt, inuenta erunt puncta, per quæ arcus ſignorũ ducuntur. </
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<
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enim ex K, loco gnomonis ad horizontalẽ lineã perpendiculari K B, & </
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<
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ri K A, quæ ſtylo æqualis ſit, iungatur recta A B, quæ eadem eſt, quę prædicta in propoſ. </
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<
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<
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ius libri, atque adeò rectæ E G, in figura latitudinum ortiuarum propoſ. </
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