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 SECVNDVS.
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ab Aequatore abſunt tot gradibus verſus eandem partem ſiue borealem, ſiue auſtralem, (prout paral-
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lelus ille comprehenſus fuerit in horologio inter boreales, auſtralesve parallelos) quot comprehendun-
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tur in declinatione illius paralleli. </
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<
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<
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<
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ctatur grad. </
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<
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<
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<
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<
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verſus boream, ſiue verſus auſtrum, prout ille parallelus in boream quoque, vel auſtrum declinat in ho-
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rologio. </
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<
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">Ita quoque vmbra ſtyli percurrente parallelum ♋, cuius declinatio eſt borealis, & </
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<
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<
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titudo borealis quoque eſt, atque gradus complectitur 23. </
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<
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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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">DOMOS cœleſtes, hoc eſt, communes ſectiones plani horolo-
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gij, & </
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<
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">circulorum poſitionum, qui per initia, vel quaſcunque partes
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domorum cœleſtium ducuntur, in eodem horologio horizontali de-
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ſcribere.</
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<
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<
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">qui docet, circulos domorum cœleſtium (qui
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morum cœle-
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ſtium in eodem
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horologio hori
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zontali, ſecun-
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dum Ioan, Re-
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giom.</
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quidem ſunt ex numero circulorum, quos poſitionum dicunt.) </
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<
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æquales, tranſireq́; </
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rologio horizontali deſcribemus. </
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<
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">Circulus iam ſæpius ex E, deſcriptus in partes 360. </
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<
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uidatur, initio facto à linea meridiana. </
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<
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dibus 30. </
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<
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tur ſecantes lineam æquinoctialem in punctis, per quæ ſi rectæ agantur ipſi lineæ meridianæ æqui
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diſtantes; </
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<
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">(quod quidem facile fiet, ſi ducatur recta C D, lineæ æquinoctiali parallela ſecans meri-
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<
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dianam lineam in B; </
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<
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">omnia puncta lineæ æquinoctialis beneficio circini ex I, accepta trans-
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ferantur in lineam C D, ex puncto B. </
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<
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r
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ab I, & </
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<
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">B, remota, parallelæ erunt) deſcriptæ erunt domus cœleſtes, ſecundum Ioan. </
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</
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Quod ita oſtendi poteſt.</
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deſcriptionis d@
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morum cœle-
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ſtium ſecundũ
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Ioan. Regio@.</
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ſectiones Meridiani, atque Horizontis, diuiduntq́ Æquatorem in partes æquales, initio facto à Me
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ridiano circulo, qui initium eſt domus decimæ cœleſtis, quam domus vndecima, & </
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quuntur verſus ortum; </
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<
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Horizonte, & </
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domus, tribuendo ſingulis domibus grad. </
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culi ex E, deſcripti, ſint communes ſectiones Æquatoris, & </
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<
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ſi dictus circulus ex E, deſcriptus circa æquinoctialem lineam circumuolui intelligatur, donec in
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plano Æquinoctialis circuli poſitus ſit, atque adeò eius centrum in centro mundi, ducentur dicti
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circuli domorum cœleſtium per illa diuiſionum puncta, & </
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