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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ſtralis F G, ſecans Meridianum in K, vt ſit arcus ſemidiurnus datus F k. </
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<
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, & </
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<
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, ſit polus arcticus, ducatur per propoſ. </
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<
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F, ſecans Ae-
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quatorem in I. </
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<
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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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I E, arcus eſt anguli I
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E, quòd arcus
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E,
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I, ex coroll. </
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<
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ſint; </
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<
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E, totidem graduum, quot arcus ſemidiurnus datus continet. </
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reliquus duorum rectorum (qui grad. </
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C, notus erit. </
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triangulo ſphærico C F
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, angulus C, rectus eſt; </
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zontis ductus ad Horizontem rectus eſt, per propoſ. </
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<
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<
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quadrans eſt; </
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, arcus altitudinis poli minor ſemper eſt quadrante; </
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xml:space
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">& </
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<
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arcus Horizontis inter Meridianum, & </
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trionalis, arcus C F, minor quadrãte, vel ſi parallelus eſt auſtralis, quadrante maior; </
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<
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H I, inter polum, & </
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<
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in auſtrali verò maior quadrante) erit per propoſ.
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poſ. </
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triangulorum ſphęricorum, vt ſinus anguli C H F,
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noti ad ſinum totum, ita ſinus complementi an-
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guli C F H, ad ſinum complementi arcus C H: </
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Et conuertendo, vt ſinus totus ad ſinum anguli
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C H F, noti, ita ſinus complementi arcus C H, al-
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titudinis poli, ad ſinum cõplementi anguli C F H.
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</
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<
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quartum, nempe ſinus complementi anguli CFH,
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ex regula proportionum; </
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mentum anguli ex tabula ſinuum, & </
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<
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C F H, & </
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<
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I F B, notus erit. </
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co B F I, angulus B F I, notus ſit, & </
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<
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altitudini Aequatoris ſupra Horizontem æqualis,
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hoc eſt, complemento altitudinis poli; </
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<
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<
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<
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<
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<
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<
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vel per propoſ. </
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<
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vt ſinus arcus I B, noti (eſt enim I B, differen tia inter arcum ſemidiurnum I E, datum, & </
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tem B E) ad ſinum anguli B F I, noti, ita ſinus arcus I F, ad ſinum anguli I B F, altitudinis Aequa-
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toris: </
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<
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">Et conuertendo, vt ſinus anguli B F I, noti ad ſinum arcus I B, noti, ita ſinus anguli I B F,
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noti ad ſinum arcus I F; </
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<
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num, nimirum ſinus arcus I F, declinationis paralleli propoſiti; </
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<
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<
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nationis I F, notus fiet.</
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</
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<
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<
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">ITAQVE ſi fiat, vt ſinus totus ad ſinum arcus, quo arcus ſemidiurnus datus à ſemicirculo
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differt, hoc eſt, ad ſinum anguli C H F, (qui cum E H I, angulo arcus ſemidiurni duos rectos an-
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gulos conficit) ita ſinus complementi arcus C H, altitudinis poli ad aliud, inuenietur ſinus com-
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plementi anguli C F H, vel I F B; </
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<
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<
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gulus ipſe I F B. </
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<
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">Quòd ſi rurſus fiat, vt ſinus anguli I F B, iam noti, ad ſinum arcus I B, quo arcus
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ſemidiurnus à quadrante differt, ita ſinus altitudinis Aequatoris, vel complementi altitudinis po
<
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li, nempe anguli I B F, ad aliud, notus efficietur ſinus arcus I F, declinationis paralleli F G, quæſi-
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tæ; </
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<
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<
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</
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<
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<
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<
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<
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I E, horarum 7. </
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<
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<
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="
echoid-s6629
"
xml:space
="
preserve
">105. </
s
>
<
s
xml:id
="
echoid-s6630
"
xml:space
="
preserve
">vel 75. </
s
>
<
s
xml:id
="
echoid-s6631
"
xml:space
="
preserve
">Vnde arcus I B, continebit vnam horam, hoc eſt,
<
lb
/>
grad. </
s
>
<
s
xml:id
="
echoid-s6632
"
xml:space
="
preserve
">15. </
s
>
<
s
xml:id
="
echoid-s6633
"
xml:space
="
preserve
">Si igitur fiat, vt 100000. </
s
>
<
s
xml:id
="
echoid-s6634
"
xml:space
="
preserve
">ſinus totus, ad 96592. </
s
>
<
s
xml:id
="
echoid-s6635
"
xml:space
="
preserve
">ſinum anguli C H F, (cum enim arcus
<
lb
/>
I E, comprehendat horas 7. </
s
>
<
s
xml:id
="
echoid-s6636
"
xml:space
="
preserve
">ſiue grad. </
s
>
<
s
xml:id
="
echoid-s6637
"
xml:space
="
preserve
">105. </
s
>
<
s
xml:id
="
echoid-s6638
"
xml:space
="
preserve
">loquimur enim de parallelo boreali, comprehendet re-
<
lb
/>
<
note
position
="
left
"
xlink:label
="
note-0128-06
"
xlink:href
="
note-0128-06a
"
xml:space
="
preserve
">50</
note
>
liquus arcus ſemicirculi horas quinque, hoc eſt, grad. </
s
>
<
s
xml:id
="
echoid-s6639
"
xml:space
="
preserve
">75. </
s
>
<
s
xml:id
="
echoid-s6640
"
xml:space
="
preserve
">quibus predictus ſinus 96592. </
s
>
<
s
xml:id
="
echoid-s6641
"
xml:space
="
preserve
">debetur.
<
lb
/>
</
s
>
<
s
xml:id
="
echoid-s6642
"
xml:space
="
preserve
">Quòd ſi de parallelo auſtrali ſit ſermo, erit arcus I E, horarum 5. </
s
>
<
s
xml:id
="
echoid-s6643
"
xml:space
="
preserve
">ſiue grad. </
s
>
<
s
xml:id
="
echoid-s6644
"
xml:space
="
preserve
">75. </
s
>
<
s
xml:id
="
echoid-s6645
"
xml:space
="
preserve
">& </
s
>
<
s
xml:id
="
echoid-s6646
"
xml:space
="
preserve
">reliquus ex ſemi-
<
lb
/>
circulo horatum 7. </
s
>
<
s
xml:id
="
echoid-s6647
"
xml:space
="
preserve
">hoc eſt, grad. </
s
>
<
s
xml:id
="
echoid-s6648
"
xml:space
="
preserve
">105. </
s
>
<
s
xml:id
="
echoid-s6649
"
xml:space
="
preserve
">quibus idem ſinus reſpondet) ita 74314. </
s
>
<
s
xml:id
="
echoid-s6650
"
xml:space
="
preserve
">ſinus complemen-
<
lb
/>
ti arcus C H, altitudinis poli, ad aliud, inuenietur ſinus complementi anguli C F H, vel I F B,
<
lb
/>
71781. </
s
>
<
s
xml:id
="
echoid-s6651
"
xml:space
="
preserve
">cui reſpondet arcus grad. </
s
>
<
s
xml:id
="
echoid-s6652
"
xml:space
="
preserve
">45. </
s
>
<
s
xml:id
="
echoid-s6653
"
xml:space
="
preserve
">Min. </
s
>
<
s
xml:id
="
echoid-s6654
"
xml:space
="
preserve
">52. </
s
>
<
s
xml:id
="
echoid-s6655
"
xml:space
="
preserve
">Huius complementum grad. </
s
>
<
s
xml:id
="
echoid-s6656
"
xml:space
="
preserve
">44. </
s
>
<
s
xml:id
="
echoid-s6657
"
xml:space
="
preserve
">Min. </
s
>
<
s
xml:id
="
echoid-s6658
"
xml:space
="
preserve
">8. </
s
>
<
s
xml:id
="
echoid-s6659
"
xml:space
="
preserve
">erit quan-
<
lb
/>
titas anguli I F B. </
s
>
<
s
xml:id
="
echoid-s6660
"
xml:space
="
preserve
">Si ergo rurſus fiat, vt 69633. </
s
>
<
s
xml:id
="
echoid-s6661
"
xml:space
="
preserve
">ſinus anguli I F B, ad 25881, ſinum arcus I B, grad. </
s
>
<
s
xml:id
="
echoid-s6662
"
xml:space
="
preserve
">
<
lb
/>
15. </
s
>
<
s
xml:id
="
echoid-s6663
"
xml:space
="
preserve
">ita 74314. </
s
>
<
s
xml:id
="
echoid-s6664
"
xml:space
="
preserve
">ſinus anguli IBF, vel altitudinis Aequatoris, ad aliud, reperietur ſinus arcus decli-
<
lb
/>
nationis I F, 27621. </
s
>
<
s
xml:id
="
echoid-s6665
"
xml:space
="
preserve
">ferè. </
s
>
<
s
xml:id
="
echoid-s6666
"
xml:space
="
preserve
">Quare arcus ipſe declinationis I F, continebit grad. </
s
>
<
s
xml:id
="
echoid-s6667
"
xml:space
="
preserve
">16. </
s
>
<
s
xml:id
="
echoid-s6668
"
xml:space
="
preserve
">Min. </
s
>
<
s
xml:id
="
echoid-s6669
"
xml:space
="
preserve
">2. </
s
>
<
s
xml:id
="
echoid-s6670
"
xml:space
="
preserve
">ferè, ſicu-
<
lb
/>
ti prius. </
s
>
<
s
xml:id
="
echoid-s6671
"
xml:space
="
preserve
">Eodem pacto deprehendemus parallelum, cuius arcus diurnus contineat horas 15. </
s
>
<
s
xml:id
="
echoid-s6672
"
xml:space
="
preserve
">vel
<
lb
/>
9. </
s
>
<
s
xml:id
="
echoid-s6673
"
xml:space
="
preserve
">declinationẽ habere grad. </
s
>
<
s
xml:id
="
echoid-s6674
"
xml:space
="
preserve
">23. </
s
>
<
s
xml:id
="
echoid-s6675
"
xml:space
="
preserve
">Min. </
s
>
<
s
xml:id
="
echoid-s6676
"
xml:space
="
preserve
">2. </
s
>
<
s
xml:id
="
echoid-s6677
"
xml:space
="
preserve
">ferè, & </
s
>
<
s
xml:id
="
echoid-s6678
"
xml:space
="
preserve
">ſic de cęteris. </
s
>
<
s
xml:id
="
echoid-s6679
"
xml:space
="
preserve
">Quocirca dato arcu diurno, & </
s
>
<
s
xml:id
="
echoid-s6680
"
xml:space
="
preserve
">lati
<
lb
/>
tudine loci, declinationẽ paralleli illius arcus ab Aequatore inquiſiuimus. </
s
>
<
s
xml:id
="
echoid-s6681
"
xml:space
="
preserve
">Quod faciendũ erat.</
s
>
<
s
xml:id
="
echoid-s6682
"
xml:space
="
preserve
"/>
</
p
>
</
div
>
</
text
>
</
echo
>