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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huius libri cõmunes ſectiones ſunt Aequatoris, & </
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<
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xml:space
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">maximorũ circulorũ per polos mundi, & </
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<
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xml:space
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Italicas paralleli ♋, tranſeuntium, inſtar circulorũ horariorũ à meridie, vel media nocte, ſecabitur
<
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linea æquinoctialis in punctis, per quæ ad ipſam perpendiculares lineæ eductæ ſecabunt tropicum
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♋, in horis Italicis, ſiue ab occaſu Solis, cum hæ perpendiculares ſint lineæ horariæ ab occaſu So-
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lis, Sole exiſtente in principio ♋, ac ſi eſſent communes ſectiones plan@ horologii, & </
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<
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maximorum per polos mundi, & </
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<
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xml:space
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">horas Italicas in tropico ♋, tranſeuntium, vt ex ſupra demonſtra
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tis liquet. </
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<
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cadent horæ in arcubus a G, b I, (quales ſunt in noſtro exemplo 23. </
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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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<
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xml:space
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">in planum horologii
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ſuperioris, cum circulus horæ 6. </
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<
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">à meridie, vel media nocte, cui planum horologii æquidiſtat, per
<
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rectam G I, ducatur; </
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<
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xml:space
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">vt conſtat, ſi circulus F G H I, in propria poſitione intelligatur eſſe conſtitu-
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tus, ita vt centrum illius idem ſit, quod centrum mundi, & </
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xml:space
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">Eodem modo ſi recta a b,
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transferatur vltra centrum circuli in d e, ita vt d F e, ſit arcus diurnus ♑, & </
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<
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xml:space
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">rurſus circulus in ho-
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ras 24 ſecetur, initio facto à puncto d, hoc eſt, à termino occidẽtali, reperiemus in tropico ♑, pun-
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cta horarum Italicarum. </
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<
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xml:space
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">Si igitur puncta horarum Italicarum in tropicis inter ſe reſpondentium
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rectis lineis iungantur, deſcriptum erit horologium Italicum polare. </
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<
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xml:space
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cæ per puncta horarum à meridie, vel media nocte in linea æquinoctiali. </
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<
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xml:space
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<
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quintam à meridie, 22. </
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<
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<
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">c. </
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">vt perſpicuum eſt ex tabula propoſ. </
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<
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">19. </
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<
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<
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">Vnde ſi ali
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quæ horæ Italicæ in alterutro tropicorum in altero tropico non habeant puncta reſpondentia, du-
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cendæ ſunt illæ per horas à meridie, vel media nocte reſpondentes in linea æquinoctiali, vt ex di-
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cta tabella propoſ. </
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<
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<
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<
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">colligitur. </
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<
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puncta in tropico ♋, inuenta, & </
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<
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">à media nocte in linea æquinoctiali, quia in tro
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pico ♑, non habent puncta reſpondentia illis, quæ in tropico ♋, inuenta ſunt. </
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<
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ra 23. </
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<
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<
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<
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linea, & </
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per punctum in tropico ♋, inuentum. </
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<
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ſu, cum Aequatore eandem communem ſectionem habent, per propoſ. </
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