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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91 - 120
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391 - 420
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GNOMONICES
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lineam referat, adeò vt, ſi planum ſit firmum, ae
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ſtabile, & </
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<
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med. </
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<
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<
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">ducenda ſit prius, beneficio libellę, ac perpendiculi, in dato plano recta C S, Horizonti
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ęquidiſtans, & </
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<
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">ad hanc excitanda perpendicularis D E, pro linea meridiana, quæ priorem ſecet
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in A. </
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">& </
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<
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uis magnitudinis ex E, reliqua perficienda, vt in Meridiano horologio cap. </
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<
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<
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">DE ARCVBVS SIGNORVM, ET LON-
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gitudinum dierum in horologio Polari. CAP. XVII.</
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<
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">ARCVS ſignorum, & </
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">longitudinum dierum, qui omnes ſunt hyperbolæ, deſcribentur hic,
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">Deſe@i@ti@ ar-
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cuum ſignorũ,
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& longitudinũ
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dierum in Po-
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@arii horologio.
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Hotizontalis li
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mea in horolo-
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gio Polari, quo
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m@do deſcriba
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tur.</
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vt in Meridiano horologio, ex figura radiorum Zodiaci cap. </
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<
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<
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neam, quę ibi ſextę horę deputabatur, hic horam 12. </
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<
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talis linea ita ducetur. </
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<
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<
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<
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">æquinoctialem lineam interſecat, arcus cir
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culi verſus meridianam lineam deſcribatur, ſurſum verſus, (voco partem ſuperiorem illam,
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quæ ſupra lineam æquinoctialem eſt, poſito horologio in proprio ſitu, ita vt horę à med.
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</
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<
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<
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<
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">pomeridianę ad dexteram) in quo ſumpto arcu, qui comple-
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mento altitudinis poli ęqualis ſit, ducatur ex fine ipſius ad 9. </
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<
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<
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">in linea equino-
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ctiali linea recta, quę lineam horę 12. </
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">ſecabit in puncto D, per quod recta æquinoctiali lineę pa-
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rallela acta erit Horizontalis diſtribuens totum horologium in duo, quorum maius, in quo
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late Superius, &
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inferius. Item
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Diurnum, & no
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@ursum quod.</
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linea æquinoctialis comprehenditur, ſuperius, vel diurnum, alterum verò inferius noctur-
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num ve appellatur. </
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ad 12. </
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arcus borealium ſignorum, &</
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<
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facienda non eſt. </
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<
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">Sunt autem arcus ſignorum auſtralium illi, qui exiſtunt ſupra lineam æqui-
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noctialem, verſus horizontalem lineam procedendo: </
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<
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ctialem lineam ſunt deſcripti. </
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<
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">DE HOROLOGIO POLARI ITALICO,
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& Babylonico. CAP. XVIII.</
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