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 SEPTIMVS.
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ſunt deſcripti, &</
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<
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<
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<
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xml:space
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cuum longitu-
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dinum dierum
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in horologio ho
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rizontali.</
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tudinum dierum horarum 14. </
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<
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<
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<
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<
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<
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dam inſignitos, ne cum radijs ſignorum confundantur. </
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<
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indigemus. </
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<
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<
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">ſcripſimus, iudicabimus, quinam arcus
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diurni ſint hyperbolæ, & </
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<
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">qui parabolæ, vel Ellipſes, ſi pro radiis ſignorum oppoſitorum ex pun-
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cto D, in figura radiorum Zodiaci dicti capitis ducantur duo radii diurni oppoſiti, hoc eſt, æqua-
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liter à radio Aequatoris diſtantes.</
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<
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style
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Italico, & Babylonico. CAP. IIII.</
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<
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<
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<
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">æquales, initio facto à puncto
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rologii @alici
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& Babyl
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enici
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horizontalis.</
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N, numereturq́ue ad vtraſque partes N, arcus ſemidiurnus paralleli ♋, nempe ad latitu
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dinem grad. </
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<
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<
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<
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<
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">b, ducaturq́ue recta a b, ita vt, poſito cir
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culo N a M b, parallelo ♋, arcus a N b, ſit portio illius ſupra terram, & </
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<
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</
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<
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us ad vtraſque partes N, arcus ſemidiurnus paralleli ♑, nempe ad eandem latitu
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dinem grad. </
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<
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<
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<
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<
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">e, ducaturq́ue recta de, ita vt, poſito eo-
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dem circulo N d M e, parallelo ♑, arcus d N e, ſit portio illius ſupra terram, & </
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<
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fra terram. </
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">Idem circulus M a d N e b, alio modo diuidi poteſt in arcum diurnum ♋, & </
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cuimus in ſcholio propoſ. </
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<
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<
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ſtruemus. </
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<
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">horas æquales, initio facto à puncto b, quod nimi
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rum, horologio proprium ſitum habente, ad occaſum vergit, ac per puncta diuiſionum, & </
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xlink:href
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trum E, rectæ ducantur occultæ ſecantes æquinoctialem lineam in punctis, per quæ ſi alię occul-
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tæ rectæ ducantur ex H, centro horologii, ſecabitur tropicus ♋, in punctis, per quæ ducendæ ſunt
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horæ ab occaſu Solis, quę diligenter notentur. </
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</
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<
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">centrum E, ducta recta f E, ſecat lineam æquinoctialem in g; </
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<
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cum ♋, in h, puncto, per quod linea horæ 18. </
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habenda eſt de cæteris. </
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<
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<
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quales in noſtro exemplo ſunt hora 23. </
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<
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quæ per diametrum opponuntur iſtis horis in circulo ex E, deſcripto (habentur autem horæ op-
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poſitę ex additione horarum 12. </
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<
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ctus maior fuerit, quàm 24. </
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<
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ræ 23. </
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<
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<
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<
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nent 11. </
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<
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<
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quæ, ſi ex H, ducantur rectæ, ſecabitur quidem tropicus ♋, in punctis, quæ horis iſtis oppoſitis </
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