Vitruvius
,
De architectura libri decem
,
1567
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logium in plano finitoris mobilis ratione meridiani immobilis, illi eſt ad angulosrectos, ſed ratione finitoris im-
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mobilis ad illum eſt inclinatum. </
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<
s
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xml:space
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">Demum horologum in plano meridiani mobilis, neque ad finitorem, neque
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ad meridianum immobiles cadit ad angulos rectos, ſed ad utrunque est inclinatum. </
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<
s
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xml:space
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">Conueniunt in hoc omnia
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inclinata, quod in utraque ſuperficie confici, & </
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<
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<
s
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xml:space
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">Ac primum horologia inclinata ad finitorem,
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& </
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<
s
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xml:space
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">recta ad meridianum faciem alteram habet ad ſuperiorem, altera ad inferiorem partem ſpectantem. </
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<
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xml:space
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logia in plano uerticalis mobilis faciem unam a meridiano declinantem habent, alteram ad alteram partem
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meridiani. </
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<
s
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xml:space
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">horologia demum in plano meridiani mobilis altera facie declinant ab ortu, altera ad occaſum.
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</
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<
s
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xml:space
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">Conueniunt quoque quod omnia ex iam deſcripto analemmate ſumuntur. </
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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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">circunferentias eas ſumunt, a
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quibus tum altitudo, tum latitudo Solis juper ea plana comparatur. </
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<
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<
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parietum, & </
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<
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">planorum, in quibus deſcribenda ſunt horologia, multis instrumentis excipiuntur, quæ paſſim
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videre licet. </
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<
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xml:space
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">Hæc autem omnia ſi recte perpendantur, & </
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">animo uerſentur, facilem nobis aditum ad maiora
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patefacient, quorum demonſtrationes (ut dixi) & </
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<
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<
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">De horologiorum ratione, & uſu, atque eorum inuentione
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& quibus inuentoribus. # Cap. IX.</
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<
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<
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excauatum ex quadrato ad enclimaq́; </
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<
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xml:space
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">ſucciſum, Beroſus Chaldæus dicitur
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inueniſſe: </
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<
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">ſcaphem, ſiue hemiſphærium, Ariſtarchus Samius. </
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<
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xml:space
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">Idem etiam diſcum in pla-
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<
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">20</
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nitia, arachnem Eudoxus Aſtrologus. </
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<
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">Nonnulli dicunt Apollonium; </
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<
s
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">plinthium ſiue la-
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cunar (quod etiam in Circo Flaminio eſt poſitum) Scopas Syracuſanus,: </
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<
s
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">pros ta iſto-
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rumena, Parmenion. </
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<
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">pros pan clima, Theodoſius, & </
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rus Conum. </
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<
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xml:space
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">Apollonius pharetram, aliaq́; </
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<
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">genera, & </
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<
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">qui ſupraſcripti ſunt, & </
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<
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">alij plures inuenta reli-
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querunt, uti Gonarchen, Engonaton, Antiboræum. </
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<
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xml:space
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">Item ex his generibus uiatoria penſilia uti ſie-
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rent plures ſcripta reliquerunt: </
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<
s
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xml:space
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">ex quorum librjs, ſi quis uelit ſubiectiones inuenire, poterit, dummodo
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ſciat analemmatum deſcriptiones.</
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<
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</
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<
s
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xml:space
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">Quæ a Vitruuio ponuntur hoc loco ſatis explicari poterunt ab his, qui analemmatum rationes, & </
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ræ circulos proijcere in planum ſciunt, nam cuilibet experto integrum erit horologia ad quancunque formam
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deducere. </
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>
<
s
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xml:space
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">Beroſus ut arbitror horologium ex quadrato ſucciſum cum parallelis ſignorum circulis, & </
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<
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ad unam cœli inclinationem inuenit. </
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<
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">At Aristarchus in hemiſphærio id poſuit, atque etiam in excauato uaſe,
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ſed non ad perfectum hemiſphærium, quod diſcum appellauit. </
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>
<
s
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xml:space
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">omnia hæc horologia, ideſt ſucciſum ad unam
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declinationem ex quadrato, & </
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<
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">hemiſphærium, & </
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<
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">diſcus, habebant omnes circulos in linea lacotomo, & </
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<
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circulo menstruo contentos, omnemq́; </
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<
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">planè Solis declinationem. </
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>
<
s
xml:id
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">nos integram ſphæram ad omnem cœli in-
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clinationem perforatam, cum circulis par allelis, & </
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<
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">horarijs confecimus, tropicis tamen mobilibus, ut omnia
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horarum genera imponeremus, confecimus, qua non ſolum pro communi horologio ad omnes cœli inclinationes
<
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uteremur, ſed ut eo inſtrumento in omnia planorum genera ſiue ea finitoris plano, ſiue uerticali, ſiue meridia-
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no, hisq́; </
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<
s
xml:id
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xml:space
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">tam firmis quàm mobilibus præfinirentur omnibus quibus libuerit horis inſcriptis, gnomone medio,
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cuius apici ſi lucerna adhibeatur in tenebris ſphæram in parietem oppoſitum, ſeu quodcunque planum proij-
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ciet, ita ut ratio astrolabij illo experimento facile dignoſci poſſit. </
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>
<
s
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xml:space
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">Cæterum horologia a multis inuenta ſunt
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ex naturalibus formis, & </
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<
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">ex artificialibus figuris, unde alij folia arborum, alij cruces, alij stellas, aut naues,
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<
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">40</
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nos in auium, & </
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<
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">animalium formas plura confecimus, quæ omnia ex Solis altitudine gnomonis ad umbram
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proportione, circumferentiarum, & </
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<
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">angulorum ratione eliciuntur & </
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<
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">ad propoſitas formas accommodantur,
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quorum analemmata uulgus ignorat, & </
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<
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">effectus admiratur. </
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<
s
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xml:space
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">Ideo araneæ forma horologium eſſe poterat, li-
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neis horarijs circulos altitudinis Solis oſtendentes traijcientibus, qualia ſunt in diagram. </
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<
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">B. </
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<
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<
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<
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thus erat truncus, in quo plura horologiorum genera recta, inclinata, & </
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<
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">declinantia deſcribi poterant. </
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<
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xml:space
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">Pha-
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retræ ſimiha erant horologia ad ortum, ſeu ad occaſum ſpectantia, quæ ſuperius in plano meridiani deſcripſi-
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mus. </
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<
s
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xml:space
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">ſimiliratione ex his, quæ mercatores de diuerſarum regionum inclinationibus referebant, Parmenion
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ad eas inclinationes horologia deſcribebat: </
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<
s
xml:id
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xml:space
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">quæ in uniuerſum Theodoſius, & </
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<
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">Andreas ad omnes cœli tractus,
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& </
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<
s
xml:id
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">inclinationes orbis faciebant: </
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>
<
s
xml:id
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xml:space
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">nam horologium quodcunque in æ quinoctiali, aut in plano axis deſcriptum,
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modo ex tetrante eleuetur ad uerticem, ut ratio inclinationis poſtulat, ad omnem regionem accommodatur.
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</
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<
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Fiunt etiam horologia ad omnem inclinationem, quæ ad Solis curſum ſuſpenſa uertuntur, cuiuſmodi eſt illud
<
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Ioannis Stabij, a quo Petrus Apianus folium populi conformauit. </
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<
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truuij, & </
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<
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<
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">Munſthero adiectis. </
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>
<
s
xml:id
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xml:space
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">Pelecinon a ſecuri forma dictum eſt, quale
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dixerim eſſe horologium, quod hyperboles habet a circulis parallelis in plano finitoris, aut uerticalis deſcri-
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ptas. </
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>
<
s
xml:id
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xml:space
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">Conus est, ſi regula centri in non apparenti hemiſphærio extendatur utrinque per ſummas tropicas
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declinationes. </
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>
<
s
xml:id
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xml:space
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">Planum hoc dicitur conus declinationum, huius extrema ad nullam ſuperficiem obiectam ter-
<
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minantur, quale trigonum Zodiacum eſſe dices. </
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>
<
s
xml:id
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xml:space
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">quod est tanquam analemma, ſi quis recte ipſum conſiderat.
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</
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<
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">engonaton. </
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<
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">Gonarchen, & </
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<
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">Antiboræum puto ita fuiſſe fabricata, ut ad Aſteriſmum & </
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>
<
s
xml:id
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xml:space
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">ſydus aliquod, uel ad
<
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aliquas cœli partes, etiam pro nocturno horario aſpectantia reſpiciant, ſubiectis proprijs analemmatis. </
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>
<
s
xml:id
="
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xml:space
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">Via-
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toria penſilia ſunt quadrantes, cylindri, annuli, planæ circulorum ſuperſicies, & </
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>
<
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">huiuſmodi, & </
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<
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<
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