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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0627
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LIBER SEPTIMVS.
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<
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<
s
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xml:space
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">PORRO lineæ horarum inæqualium productæ vltra lineam horizontalem exhibẽt eaſdem
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">Qua ratione Bo
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reale hotologiũ
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Ant@quum ex
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Auſtrali ortum
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habeat.</
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horas in horologio Boreali, ſi omnes partes immutentur, vt ſupradictum eſt.</
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<
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">DE HOROLOGIIS AE HORIZONTE
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declinantib{us}. CAP. XXVII.</
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<
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xml:space
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">HOROLOGIVM ab Horizonte declinans appellauimus ad initium lib. </
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<
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">1. </
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<
s
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xml:space
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">illud, cuius
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plana ſuperficies, in qua deſcribitur, ęquidiſtat circulo maximo ad Verticalẽ circulum pro-
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priè dictum recto, & </
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<
s
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">per communes ſectiones Horizontis, & </
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<
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xml:space
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">meridiani tranſeunti, ita vt commu-
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nis ſectio illius & </
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<
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xml:space
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">Horizontis ſit linea meridiana. </
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<
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xml:space
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">Hoc autem quadruplex eſt. </
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<
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xml:space
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">Aut enim reſpi-
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note-0627-03
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">Horologium
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ab Horizon@e
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declinans qua-
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druplex.</
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cit Zenith, & </
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<
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">orientem Solem, vel ſpectat ad Nadir, & </
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<
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xml:space
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">ad Solem occidentem, ita vt angulus incli-
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nationis, quem cum Horizonte conſtituit, vergat ad occaſum: </
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<
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xml:space
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">Aut reſpicit Zenith, & </
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<
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">Solem occi
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dentem, vel ad Nadir, & </
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<
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xml:space
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">ad orientem Solem pertinet, ita vt angulus inclinationis verſus ortũ con-
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ſtituatur. </
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<
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xml:space
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">Primum dici poteſt horologium ſuperius orientale; </
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<
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">quia Sole oriente ſtatim horas de-
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monſtrat, deſcribiturq́ue in parte plani ſuperiori. </
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<
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">Secundum inferius occidentale; </
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<
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">quia in parte
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inferiori plani deſctibitur, horasq́ue oſtendit vſque ad occaſum Solis. </
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<
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xml:space
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">Tertium ſuperius occi-
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dentale, & </
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<
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">quartum inferius orientale; </
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<
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">quoniam illud in ſuperiori parte plani conſtruitur indi-
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catq́ue horas vſque ad Solis occaſum, hoc verò in inferiori parte plani delineatur, horasq́ue ſta-
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tim ab ortu Solis manifeſtat.</
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<
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<
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">HOROLOGIVM igitur ſuperius ab Horizonte declinans deſcribitur, vt horologium
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xml:space
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">Deſcri@tio horo
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logii ab Hori-
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zonte declinan-
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@is.</
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auſtrale à Verticali declinans, & </
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<
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">inferius, vt ſeptentrionale, his exceptis, quæ ſequuntur. </
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<
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declinationis à Verticali circulo ſupputetur inclinatio ad Horizontem, quam inueniemus per
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propoſ. </
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<
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<
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<
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<
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">à D, quidem ad dexteram verſus B, ſi planum horologii occaſum reſpicit, eſtq́;
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</
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<
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<
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">ad ſiniſtram verò verſus A, ſi planum horologii ſuperius eſt, ſpectatq́ue ad ortum. </
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<
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<
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horologium inferius eſt, reſpicitq́ue occaſum, numeranda eſt inclinatio à D, ad ſiniſtram verſus
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A; </
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<
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">ſi denique inferius eſt horologiũ, & </
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<
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">ad ortum pertinet, ſupputanda eſt inclinatio à D, ad dex-
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teram verſus B. </
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<
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">Deinde in arcu circuli ex β, deſcripto numerandum eſt à recta A B, complemen
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tum altitudinis poli, non autem ipſa altitudo poli, vt in horologiis à Verticali declinantibus prius
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fiebat, ſupra quidem rectam A B, ſi ſuperius eſt horologium, infra verò, ſi inferius. </
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<
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">Reliqua omnia
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fiant, vt in horologiis declinantibus à Verticali, vt figura ipſa indicat, in qua ponitur horologium
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ſuperius ad occaſum ſpectans, declinatio vero ab Horizonte grad. </
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<
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<
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">Ordo in horis hic eſt. </
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<
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">Re-
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cta C E, ſemper eſt linea horæ 12. </
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<
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">meridiei, præcedentes verò eam ad ſiniſtram verſus A, oſtendũt
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horas pomeridianas, ſequentes verò eandem verſus dexteram B, pertinent ad horas antemeridia-
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<
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xlink:label
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xml:space
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">Ordo horarum
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in horologio de
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clinante ab Ho
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rizonte.</
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nas, in horologio ſuperioritam ad ortum, quàm ad occaſum ſpectante. </
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<
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">In inferiori autem horo-
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logio occaſum reſpiciente, vel ortum recta C E, eſt linea horæ 12. </
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<
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<
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