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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ctialem lincam in F, per quod ex H, centro horologii recta emittatur ſecans tropicum ♑, in K.
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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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">punctum K, erit illud, in quod vmbra ſtyli cadit il. </
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la hora, qua principium ♉, aſcendit, Sole exiſtente in principo ♑, atque adeò per K, tráſibit quo-
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que communis ſectio plani horologii, & </
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<
s
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xml:space
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<
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xml:space
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">Quare recta per puncta C, & </
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<
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xml:space
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">K,
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ducta erit communis ſectio plani horologii, & </
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<
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xml:space
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">Eclipticæ eo tempore, quo principium ♉, ſup ra
<
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Horizontem aſcendit, & </
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<
s
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xml:space
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">in quam tunc vmbra gnomonis cadit, ex 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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">Sole
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exiſtente ſupra Horizontem in quocunque puncto Eclipticæ. </
s
>
<
s
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xml:space
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preserve
">Igitur recta C K, dabit ſignum ♉,
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aſcendens. </
s
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<
s
xml:id
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xml:space
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preserve
">Eodem modo reliqua ſigna aſcendentia deſcribemus, ſumendo ſingula ſigna vnà cum
<
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horis ex duabus tabellis, (primò quidem ex alterutra priorum duarum tabellarum, ſecundo autem
<
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ex alterutra duarum poſteriorum) vt duo puncta inueniantur, vnum in linea æquinoctiali, & </
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>
<
s
xml:id
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xml:space
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">in al-
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terutro tropico alterum, per quæ communis ſectio Eclipticæ, & </
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>
<
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xml:space
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">plani horologij incedat, &</
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xml:space
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<
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</
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<
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<
s
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xml:space
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">CÆTERVM, ex neutra duarum priorum tabellarum accipiendæ ſunt in horologio hori-
<
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zontali horæ illorum ſignorum, quæ ſex horis, vel pluribus ante, vel poſt meridiem oriuntur. </
s
>
<
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xml:id
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xml:space
="
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">Illæ
<
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enim in æquinoctialem lineam non cadunt, vt patet. </
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>
<
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xml:space
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">Quare ex vtraque ſunt ſolum aſſumenda in
<
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/>
horizontali horologio priora quinque ſigna, quæ primum ſequuntur, qualia ſunt ♉, ♊, ♋, ♌, ♍,
<
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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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">Rurſus ex neutra duarum poſteriorum tabellarum ſumendæ ſunt in eodem
<
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horologio horizontali horæ illorum ſignorum, quæ tot horis poſt, vel ante meridiem oriuntur,
<
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quot in arcu ſemidiurno ♋, vel ♑, continentur, vel pluribus. </
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<
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xml:space
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">Nam illę horæ tropicos non ſecant,
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vt conſtat. </
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<
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xml:space
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">Vnde ex tertia tabella ſumentur tantummodo horæ priorum quinque ſignorum, ſimi
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liter & </
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xml:space
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">ex quarta, relicto primo ſigno in vtraque tabella: </
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xml:space
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">cuiuſmodi ſunt hæc ſigna. </
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<
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xml:space
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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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">Neque verò propterea ſuperuacanea cenſenda ſunt reliqua poſteriora ſex
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ſigna harum tabularum, quoniam eorum vſus in alijs horologiis, quæ ſequuntur, vt in Meridia-
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no vtroque, & </
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xml:space
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">in declinantibus, & </
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<
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xml:space
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">inclinatis, neceſſarius omnino eſt, vt ex ſequentibus fiet
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perſpicuum.</
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xml:space
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gnorum @Arie-
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tis, & Libræ a-
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ſcendentium.</
note
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<
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<
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">♎, ita deſcribentur. </
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">Quoniam aſcendente principio ♈, & </
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<
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xml:space
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">Sole exi-
<
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ſtente in principio ♑, meridies inſtat, vt conſtat ex quarta tabella; </
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<
s
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xml:space
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">perſpicuum eſt, communem
<
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tunc ſectionem plani horologii, & </
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<
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xml:space
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">Eclipticæ tranſire per illud punctum tropici ♑, per quod me-
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ridiana linea ducitur. </
s
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<
s
xml:id
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xml:space
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">Quoniam verò eo tempore Æquator, circulus horæ ſextæ à meridie vel me
<
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<
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dia nocte, Ecliptica, & </
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<
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xml:space
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">Horizon, eandem habent communem ſectionem, vt ex ſphæra materiali li-
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quet, cui planum horologij æquidiſtat, cum parallelum ſit Horizonti; </
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<
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xml:space
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">parallelæ erunt, per propoſ.
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</
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<
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xml:space
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">18. </
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>
<
s
xml:id
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xml:space
="
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">ſuperioris lib. </
s
>
<
s
xml:id
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xml:space
="
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">linea æquinoctialis, linea horæ ſextæ à mer. </
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<
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xml:space
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">vel med noc. </
s
>
<
s
xml:id
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xml:space
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">& </
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>
<
s
xml:id
="
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xml:space
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">communis ſectio
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Eclipticæ, ac plani horologii. </
s
>
<
s
xml:id
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xml:space
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">Recta igitur æquinoctiali lineæ, vel ipſi lineæ horæ ſextæ parallela
<
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per punctum, in quo linea meridiana tropicum ♑, ſecat, educta dabit ſignum ♈, aſcendens. </
s
>
<
s
xml:id
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xml:space
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">Ea-
<
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demq́ue ratione recta, quæ per punctum, in quo linea meridiana tropicum ♋, ſecat, lineæ æquino-
<
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ctiali ducitur parallela, ſignum ♎, aſcendens dabit: </
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>
<
s
xml:id
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xml:space
="
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">quoniam etiam hoc ſignum in meridie ori-
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tur, Sole exiſtente in princ̃ipio ♋, vt ex tertia tabella manifeſtum eſt, &</
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>
<
s
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xml:space
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">c.</
s
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<
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</
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<
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xml:space
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">Deſctiptio fi-
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gnorum Cácri,
<
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& Capricorni,
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aſcendentium.</
note
>
<
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<
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xml:space
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">POSTREMO lineæ, ♋, & </
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<
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xml:space
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">♑ hoc modo poterunt deſcribi. </
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<
s
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xml:space
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">Quia aſcendente principio ♋,
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& </
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>
<
s
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xml:space
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">Sole exiſtente in principio ♑, inſtat hora 4. </
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>
<
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xml:space
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">min. </
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>
<
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">28. </
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>
<
s
xml:id
="
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"
xml:space
="
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">poſt meridiem, vt ex quarta tabella con-
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ſt@t, hoc eſt, Sol tunc, vel principium ♑, occidit, ſecabunt Ecliptica, & </
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>
<
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="
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xml:space
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">circulus horæ 4.</
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