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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<
s
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xml:space
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">POSVIMVS autem in iſtis tabellis omnes horas à mer. </
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<
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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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">med. </
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<
s
xml:id
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echoid-s32288
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xml:space
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<
s
xml:id
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echoid-s32289
"
xml:space
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">ita vt omnes deſcribi
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poſſint in vtroque Meridiano horologio, quamuis eæ, quæ ſupra lineam horizontalem cadunt,
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ſint ſuperfluæ. </
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>
<
s
xml:id
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echoid-s32290
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xml:space
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">Idem fecimus in hoſis ab occ. </
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<
s
xml:id
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echoid-s32291
"
xml:space
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">Sole Aequatorem percurrente: </
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<
s
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xml:space
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">Et ſi viſum fuerit,
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idem fieri poterit in eiſdem horis ab occ. </
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<
s
xml:id
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echoid-s32293
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xml:space
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">Sole in tropicis exiſtente; </
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<
s
xml:id
="
echoid-s32294
"
xml:space
="
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">quod tamen non fecimus, ſed
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eas duntaxat horas notauimus, quæ infra horizontalem lineam cadunt, cum eas ſolum vmbra ſty-
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li indicet, Sole ſupra Horizontem extante.</
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<
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</
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<
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<
s
xml:id
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echoid-s32296
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xml:space
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">IGITVR, vt horologium Meridianum conſtruatur, in plano horologii ducatur recta A B,
<
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<
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xlink:label
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note-0518-01
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note-0518-01a
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xml:space
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">Conſtructio ho
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rologij Meridia
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ni ex tabulis.</
note
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pro linea horizontali, quæ in plano ſtabili, ac firmo ducenda eſt beneficio perpendiculi Horizon-
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ti parallela. </
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<
s
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xml:space
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">In haclocus ſtyli eligatur C, è quo circulus cuiuſq; </
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<
s
xml:id
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xml:space
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">magnitudinis deſcribatur D E F.
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</
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<
s
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xml:space
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">Deinde in orientali horologio à puncto B, verſus boream exiſtente, quod nobis ad horologium
<
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<
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xlink:label
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">10</
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conuerſis ad dextram poſitum eſt, in occidentali vero à puncto A, itidem boreali quod nobis ad
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ſiniſtram ſtatuitur, ſi faciem ad horologium conuertamus, deorſum verſus numeretur cõplemen-
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tum altitudinis poli vſque ad F, ducatur q́ue recta F C D, quam in centro C, ad angulos rectos ſe-
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cet recta E C. </
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<
s
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xml:space
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<
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<
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<
s
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xml:space
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">demonſtrauimus, D F, linea æquinoctialis, & </
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<
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">E C,
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linea horæ 6. </
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<
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xml:id
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">à mer. </
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<
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">vel med. </
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<
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xml:id
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xml:space
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">noc. </
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<
s
xml:id
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xml:space
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">Poſt hæc aſſumpta ſtyli longitudine, abſcindantur ei quotcun-
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que partes æquales ex recta G H, vt in præcedentibus factum eſt. </
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<
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xml:space
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">Itaque ſi pro hora 11. </
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<
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</
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<
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<
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">ſumatur latitudo vmbræ grad. </
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<
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<
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">M. </
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<
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">14. </
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<
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">quæ ſuperior eſt, & </
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<
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xml:space
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">in tropico ♋, borealis, numere-
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0518-01
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xlink:href
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turq́ue in orientali horologio à D, verſus Boreales partes, vel in parte oppoſita à puncto F, vſque
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ad K, & </
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<
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">in rectam occultam C K, in parte oppoſita transferatur ex C, eiuſdem horæ longitudo vm
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bræ P 49. </
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<
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<
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<
s
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xml:space
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">vſque ad L, inuentum erit punctum L, pro hora 11. </
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<
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">à med. </
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<
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<
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xml:space
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">in tropico ♋. </
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<
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etiam reperiemus punctum L, in tropico ♑, pro eadem hora, ſi eadem latitudo vmbræ numere-
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tur à D, verſus Auſtrum, vel in parte oppoſita ex puncto F, vſque ad K, eademq́ue longitudo vm-
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<
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bræ ex recta occulta C K, abſcindatur. </
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<
s
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xml:space
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">Quòd ſi in linea æquinoctiali accipiatur recta C M, longi
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tudini vmbræ eiuſdem horæ in Aequatore, quæ comprehendit P. </
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<
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<
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<
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<
s
xml:id
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xml:space
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">æqualis, dabit recta
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L M L, horam 11. </
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<
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xml:id
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xml:space
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">à med. </
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<
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xml:id
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xml:space
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">noc. </
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<
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xml:id
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xml:space
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">in horblogio orientali. </
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<
s
xml:id
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xml:space
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">Eadem ratione in occidentali horologio ex
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eadem latitudine, & </
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<
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">longitudine vmbræ horam 1. </
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<
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<
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">deſcribemus, vt in figura patet. </
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<
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xml:space
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eadem fiant in cæteris horis à med. </
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<
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xml:id
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<
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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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">à mer. </
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<
s
xml:id
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xml:space
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">abſolutum erit vtrumque horologium Meridia-
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num. </
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<
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xml:space
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">Quod tamen breuius ita perficiemus. </
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<
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xml:space
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">Transferantur in lineam æquinoctialem longitudi-
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nes vmbrarum pro ſingulis horis in Aequatore, imprimendo puncta in linea æquinoctiali. </
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>
<
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xml:id
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xml:space
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">Per
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hæc enim lineæ rectæ ad æquinoctialem lineam perpen diculares excitatæ dabunt horas à mer. </
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<
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<
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med. </
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<
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">noc. </
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<
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xml:id
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">Quæ ſi ex C. </
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<
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xml:id
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xml:space
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">ſecundum longitudines vmbrarum, quas in tropicis horæ habent, vel cer-
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te per lineas occultas latitudinum vmbrarum reſecentur, habebuntur puncta tropicorum. </
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<
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xml:space
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">In-
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uenientur autem vna eademq́ue opera ex eadem latitudine vmbræ octo puncta in tropicis. </
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<
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