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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rariis, neque æqualiter à duabus hinc inde poſitis diſtat. </
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<
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xml:id
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xml:space
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">Vndeſit, vt ſingulæ lineæ ex ρ, emiſſæ ſin
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gulos quoque numeros habeant affixos. </
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<
s
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xml:space
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">Ex hac igitur ſigura in dicto horologio (ſi prius in eo
<
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omnes lineæ horariæ ducantur) arcus ſignorum deſcribere licebit, cum res tulerit. </
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<
s
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xml:space
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ſumus ſiguram hanc, vt cernis, in duas, quia alioquin nimis inter ſe conſunderentur lineæ, pro-
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pterea quòd linea ſtyli primi horologii parum diſtat à linea horæ 11, vt conſtat ex ſigura prima
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propoſ. </
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<
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xml:space
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<
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xml:space
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<
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xml:space
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<
s
xml:id
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xml:space
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">in qua lineæ horariæ deſcriptæ ſunt. </
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<
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xml:space
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">In priore harum ſigurarum continentur
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lineæ horarum, quæ in horologio poſitæ ſunt ad ſiniſtram lineæ ſtyli in prima ſigura propoſ. </
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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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">3. </
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<
s
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xml:space
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">aut quæ in prima figura huius cap. </
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<
s
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xml:space
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">ad ſiniſtram collocarentur, ſi deſcriptæ eſſent; </
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<
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ſunt 5. </
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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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">11. </
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<
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xml:space
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">In poſteriori vero reliquæ horæ ad dextram eiuſdem lineę ſtyli ſitæ,
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nempe 12. </
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<
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xml:space
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">&</
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xml:space
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xml:space
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<
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xml:space
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<
s
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xml:space
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">monuimus faciendum eſſe in horologiis decli-
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nantibus, atque adeo & </
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<
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xml:space
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">in inclinatis, in quibus huiuſmodi confuſio linearum reperitur.</
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<
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</
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<
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<
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xml:space
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">POSTREMO, vt videas, quid agendum ſit in tertio horologio huius cap. </
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<
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xml:space
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">in quo lineæ
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horariæ ſunt æquidiſtantes, quæ quidem in tertia ſigura propoſ. </
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<
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<
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<
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<
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xml:id
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xml:space
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">ductæ ſunt, deſcripſi-
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mus etiam in eo arcus ſignorum: </
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<
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xml:space
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">qui quidem deſcribuntur, vt in Meridiano horologio, vel pola-
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ri, hoc excepto, quòd hic lineæ horarię in figura radiorum radium Aequatoris ad angulos rectos
<
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ſecantes habent ſingulę ſingulos numeros, non autem binos, vt ibi, niſi cum linea ſtyli vna eſt ex
<
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lineis horariis, vel certe à duabus proximis hinc inde poſitis æqualiter diſtat, quemadmodum in
<
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aliis horologiis declinantibus contingere ſolet.</
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</
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<
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xml:space
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">Horizontalis li-
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nea partitur ho
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rologium in Su
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perius, Infe-
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riusq́ue. Et in
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Diurnum, No-
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cturnumque.</
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>
<
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<
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xml:space
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">LINEA horizontalis totum horologium diuidit, vt in præcedentibus dictum eſt, in Supe-
<
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rius atque Inferius, quorum Superius eſt pars illa, quæ infra lineam horizontalem continetur:
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</
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<
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xml:id
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xml:space
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">Reliqua autem pars dabit Inferius, ſi tamen omnes partes inuertantur, vt ſupra dictum eſt, & </
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<
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xml:space
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">ho-
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ræ, quæ prius à med. </
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<
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xml:space
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">noc. </
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<
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">computabantur, nunc à mer. </
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<
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xml:space
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">numerentur, &</
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<
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xml:id
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xml:space
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">c. </
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<
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xml:id
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xml:space
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">Eadem horizonta-
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lis linea dirimit totum horologium in Diurnum, ac Nocturnum, vt in pręcedentibus explica-
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tum eſt.</
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<
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xml:id
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</
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<
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<
s
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xml:space
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">PORRO arcus ſignorum borealium continentur inter centrum horologii, & </
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<
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xml:space
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">æquinoctia-
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<
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xlink:label
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xml:space
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">50</
note
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<
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xlink:label
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xlink:href
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xml:space
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">Qui arc
<
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us ſi-
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gnorum ad bo-
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realia ſigna, &
<
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qui ad auſtralia
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pertineant.</
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lem lineam in horologiis ſuperioribus à ſeptentrione declinantibus, & </
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<
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xml:space
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">in iis etiam, quæ à meri-
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die declinant, ſi tamen centrum habeant infra æquinoctialem lineam, quemadmodum in hori-
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zontalibus horologiis: </
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<
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xml:space
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">Si autem hæc horologia à meridie declinantia centrum habeant ſupra li-
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neam æquin octialem, pertinebunt arcus inter centrum, & </
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<
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xml:space
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">æquinoctialem lineam ad ſigna auſtra-
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lia, veluti in Verticalibus horologiis ad auſtrum ſpectantibus. </
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<
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xml:space
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">Quòd ſi huiuſmodi horologia cen
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tro careant, exiſtent arcus ſignorum auſtralium ſupra lineam æquinoctialem, ſicuti in polaribus
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horologijs, &</
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<
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<
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xml:space
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">In horologiis Inferioribus contrarium prorſus eſt intelligendum.</
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</
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<
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figura radiorũ
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ad datam ſtyli
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longitudinem
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maius aut mi-
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nus horologiũ
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deſcribatur.</
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<
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<
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">QVOD ſi ex ſigura radiorum Zodiaci huius cap. </
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<
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">maius, aut minus horologium deſcriben-
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dum ſit, pro data ſtyli magnitudine, fiet id hunc in modum. </
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<
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xml:space
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">Deſcribatur ſeorſum, veluti iuxta ſi-
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guram radiorum huius propoſ. </
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<
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">vides, triangulum ρ I G, ex horologio hoc cap. </
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<
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">conſtructo, vel ex
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ipſa ſigura radiorum deſumptum, in quo axis mundi eſt ρ I; </
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<
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">Aequator I G; </
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<
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