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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GNOMONICES
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Vt ſi v. </
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<
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<
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">propoſitum horologium decies ſit maius conficiendum, ita vt ſtylus ad ſtylum, & </
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<
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">ſingula in-
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terualla ad ſingula interualla proportionem habeant decuplam, transferemus interuallum A N, decies
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in rectam C R, quę rectæ A O, reſpondet, ita vt recta C X, decupla ſit rectæ A N, & </
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<
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<
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">Vnde ſi rectè
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deſcriptum eſt horologium, neceſſe eſt, vt ſingula interualla horologii, in quo ſtylus decies maior eſt ſtylo
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horologij propoſiti, qualia ſunt interualla horaria in linea æquinoctiali, & </
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<
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">horizontali, nec non ſegmenta
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linearum horariarum inter lineam æquinoctialem, & </
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<
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<
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<
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">ſingulorum interuallorũ
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reſpondentium ſint decupla. </
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<
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">Quocirca vt accuratè, quoad eius fieri poteſt, horologium eiuſmodi deſcri-
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batur, ducendæ erunt prius linea ſtyli, æquinoctialis, & </
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<
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<
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ęquinoctialis inter lineam ſtyli, & </
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<
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">lineas horarias propoſiti horologij decuplanda in futuro horologio,
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vel multiplicanda ſecundum proportionem ſtyli, minuendave in æquinoctiali linea, à ſtyli linea initio
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facto; </
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<
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">idem{q́ue} faciendum de interuallis in linea horizontali inter lineam ęquinoctialem, & </
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<
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rias. </
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<
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xml:space
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">Nam ſi lineę horariæ puncta horarum reſpondentia, quæ in tropicis inuenta ſunt, connectentes, per
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puncta illo modo inuenta in linea æquinoctiali, vel horizontali tranſierint, accuratiſſimè delineatum erit
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borologium. </
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<
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">Quòd ſi viſum fuerit expedire, duci poterit in dato horologio linea vtcunque vel
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æquinoctiali lineę, vel horizontali æquidistans, vel ad horizontalem lineam perpendicula-
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ris, quę commode lineas horarias ſecet: </
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<
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xml:space
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">Deinde in futuro horologio alia duci illi
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reſpondens ſecundum proportionem ſtyli. </
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<
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">Nam ſi omnia interual-
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la prioris lineę multiplicentur ſecundum datam propor-
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tionem in linea poſteriori, inuenta erunt pun-
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cta, per quæ ducendæ ſunt ho-
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rariæ lineæ, & </
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