Vitruvius
,
De architectura libri decem
,
1567
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magni fuerint, qui ab ipſa natione Chaldęorum profluxerunt, oſtendunt. </
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<
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xml:space
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ſula, & </
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<
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<
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">aperuit diſciplinam. </
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<
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xml:space
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">poſtea ſtudens Antipater, itemq́; </
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<
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xml:space
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polus, qui etiam none naſcentia, ſed ex conceptione genethliologiæ rationes explicatas reliquit.
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</
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<
s
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xml:space
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">De natu ralibus autem rebus Thales Mileſius, Anaxagoras Clazomenius, Pythagoras Samius, Xeno-
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phantes Colophonius, Democritus Abderites, rationes, quibus e rebus natura rerum gubernaretur,
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quemadmodum quoſque affectus habent,excogitatas reliquerunt. </
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<
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xml:space
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">Quorum inu enta ſequuti, ſyde-
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rum ortus, & </
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<
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">occaſus, tempeſtatumq́; </
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<
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xml:space
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">ſignificatus Eudoxus, Eudamon, Calliſtus, Melo, Philippus,
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Hipparchus, Aratus, cæteriq́; </
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<
s
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xml:space
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">ex Aſtrologia parapegmatorum diſciplinis inuenerunt, & </
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<
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xml:space
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">eas poſteris
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explicatas reliquerunt. </
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<
s
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xml:space
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">Quorum ſcientiæ ſunt hominibus ſuſpiciendę, quod tanta cura fuerunt, ut
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etiam uideantur diuina mente tempeſtatum ſignificatus poſt ſuturos, ante pronunciare, quas ob res
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hæc eorum curis, ſtudijsq; </
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<
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<
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">Aedificiorum, ciuitatum, & </
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<
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xml:space
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">urbium, ne dum hominum genituras mathematici ſolent explorare, ſyderaq́;
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</
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<
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<
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<
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reijcit ab Architecto eam curam, quam multo magis renuere Chriſtiani debent, quare & </
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<
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">nos eam a noſtris
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studijs ( ut diximus ) meritò abdicauimus. </
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<
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xml:space
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">Sunt autem parapegmata ( ut Philander notat ) Astronomica
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inſtrumenta, quibus ortus, occaſusq; </
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<
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xml:space
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<
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">ſignificationes cogno ſcuntur, atque inueniun-
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tur; </
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<
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<
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">concinnata eſſent, ſiue tabellis, ſiue armillis, ſiue dioptris, & </
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ſiue aliqua alia parte. </
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">ea ſelegit ex Astronomia, ex quibus Gnomonum æquinoctialibus
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umbris analemmatorum inueniuntur deſcriptiones. </
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<
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contrarias motiones ſpectant, & </
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<
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rem ueniamus, in fine libri poſitas inſpicientes Tabulas a nostro præceptore Federico Delpbino conditas, è
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quibus ſtellarum ſitus, & </
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mus, & </
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">De horologiorum rationibus, & umbris gnomonum æquinoctia-
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li tempore Romæ, & nonnullis alijs locis.
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Cap. VIII.</
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autem ab his ſeparandæ ſunt horologiorum rationes, & </
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rum breuitates, atque depalationes.</
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<
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">Poſt longam, neceſſariam tamen digreſſionem, Vitr. </
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<
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quod eſt gnomonices fundamentum, non enim conficere genus aliquod horologij docet, uiam
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tamen aperit ad horologia cuiuſuis generis deſignanda. </
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<
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<
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Federicus Commandinus ſcite commentarios ſcripſit, cui multæ habendæ gratiæ ſunt, cum pro communi uti-
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litate ſemper inuigilet: </
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<
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relinquam, ita cum eo uſum analemmatis declarabo. </
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<
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mandini honestos labores commendes, utriuſque tamen induſtriam multum conferre ad Vitruuiani analemma
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tis uſum exiſtimabis, quod s̃tatim manifes̃tum fiet. </
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<
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uerſam aperiamus altius repetentes. </
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<
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xml:space
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">Propoſitum igitur eſt de ſecunda Architecturæ parte, quæ gnomonice
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a Græcis dicitur, pertractare. </
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<
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<
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quodcunque ad normam erectum eſt. </
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<
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">Conſueuere autem veteres ab umbris in planum a Gnomonibus proiectis
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partes diei, hoc est horas cognoſcere. </
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<
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">Eam cognitionem gnomonicen a gnomone nominauerunt. </
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<
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uero circa gnomonem aliæ aliàs pro temporum & </
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bantur, id obſeruantes, analemmata cœperunt deſignare. </
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<
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xml:space
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">Analemma enim eſtreſumptio quædam:</
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<
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xml:space
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">nam priuſ-
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quam horologia deſcriberent, deſignationes quaſdam ſumebant conquiſitas ex Solis curſu, & </
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<
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monis ad deſcribendorum horologiorum rationes accommodatas. </
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<
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xml:space
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indagatorem primo libro Vitruuium uocaſse uidimus: </
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<
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cipiebatur, hoc eſt certa illa, & </
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<
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">minima menſura, qua ædificiorum partes metiri ſolemus, ita & </
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<
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">in horologijs
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deſcribendis analemma pro modulo habetur. </
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<
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<
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">stabilitis animaduertendum eſt ad ea. </
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<
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xml:space
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">quæ di-
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cturus ſum, nam utilia erunt tum alijs multis ſpeculationibus, tum gnomonices intelligentiæ,quã optices quan-
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dam partẽ eſſe manifeſtum est, de qua libellum ſtatim ædituri ſumus. </
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<
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xml:space
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in hoc opere mir a iucunditate inſeruiunt, præcipua conus accedit, & </
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<
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xml:space
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</
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<
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">Quid uero ſit conus, & </
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<
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">conica ſuperficies hinc patebit. </
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<
s
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xml:space
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">Imagin emur immotum ſignum, infra quod circulus de-
<
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ſcriptus ſit, ex ſigno immoto ducatur linea ad ambitum circuli, quæ ambiat integram circinationis lineam,
<
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deſcribet illa figuram, quam conum mathematici,pyramidem vulgus appellant. </
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<
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xml:space
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circulus infra poſitus b c d. </
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<
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xml:space
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">quæ circunferatur per ambitum circuli,
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donec eo redeat, unde diſceßit, aio ita deformari conum, & </
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<
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<
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xml:space
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