Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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pagenum
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373
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xlink:href
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026/01/407.jpg
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<
p
id
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N26EB2
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type
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<
s
id
="
N26EB4
">Decimoſextò, antequam quieſcat turbo, inclinatur, ſuoſque orbes agit
<
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inclinato quaſi corpore, & obliquo axe; </
s
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<
s
id
="
N26EBA
">ratio eſt, quia vel axis ſeu ferreus
<
lb
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mucro tantillùm abeſt à grauitatis centro, vel aliquis plani ſcopulus, vel
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decliuis plaga turbinem ipſum inclinat; agit tamen adhuc aliquot obli
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quos gyros propter vim prioris impetus, quæ ſenſim à grauitatione tur
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binis frangitur, & tandem omninò ſuperatur. </
s
>
</
p
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<
p
id
="
N26EC6
"
type
="
main
">
<
s
id
="
N26EC8
">Decimoſeptimò, hinc, vbi terrarum tangit depreſſus turbo, ad inſtar
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lb
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rotæ deindæ rotatur; ratio eſt, quia multus adhuc remanet impetus ad
<
lb
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motum orbis determinatus, qui vbi tangitur, ſolum trochum ipſum cum
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centro ad inſtar rotæ præcipitem agit. </
s
>
</
p
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<
p
id
="
N26ED4
"
type
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">
<
s
id
="
N26ED6
">Decimooctauò, hinc vides naturam maximè gaudere motu recto qui
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/>
paulò ante turbini erecto minimè concedebatur; cur enim in vnam po
<
lb
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tiùs partem, quàm in aliam? </
s
>
<
s
id
="
N26EDE
">at verò lapſo iacentique facilè permittitur;
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lb
/>
nam in plano motus orbis rotæ facilè determinat motum rectum
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centri. </
s
>
</
p
>
<
p
id
="
N26EE6
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type
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main
">
<
s
id
="
N26EE8
">Decimononò, ad turbinem reuoco cubum illum, ſuis numeris vel
<
lb
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characteribus inſtructum, & duobus hinc inde in ſuprema, & ima facie,
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quaſi paxillis, vel communi axe munitum, cuius figuram hîc habes; vol
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uitur enim hic cubus circa ſuum axem, neque eſt noua difficultas. </
s
>
</
p
>
<
p
id
="
N26EF2
"
type
="
main
">
<
s
id
="
N26EF4
">Vigeſimò, huc etiam reuoca fuſum, qui dum turbinatim verſatur, di
<
lb
/>
uerſis etiam motibus moueri poteſt ſurſum, deorſum, dextrorſum, ſini
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ſtrorſum, ïta vt in eo mira motuum varietas obſeruari poſſit. </
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>
</
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<
p
id
="
N26EFB
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type
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">
<
s
id
="
N26EFD
">Vigeſimoprimò, reuocabis quoque motum paropſidis, dum digito
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lb
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quaſi flagellatur; eſt enim quoddam turbinationis genus, cuius ratio
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facilis eſt, & conſtat ex dictis. </
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<
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type
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Theorema
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emph.end
type
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31.
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type
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<
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id
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<
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type
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"/>
Explicari poſſunt phœnomena
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type
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<
emph
type
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italics
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motus Excentricorum
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type
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; </
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>
<
s
id
="
N26F24
">ſit circulus ALK
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M centro E; </
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>
<
s
id
="
N26F2A
">ſit alius excentricus ACOD centro B, circa quod mouea
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tur punctum A v.g. motu orbis; </
s
>
<
s
id
="
N26F32
">Primò, nulla erit inæqualitàs motus, ſed
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tantùm videbitur eſſe; </
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>
<
s
id
="
N26F38
">nam
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="
punctũ
">punctum</
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>
A, in quo ſit aſtrum poſt decurſum
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quadrantem; </
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>
<
s
id
="
N26F42
">videbitur in N; </
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>
<
s
id
="
N26F46
">igitur videbitur tantùm confeciſſe arcum A
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N minorem quadrante; </
s
>
<
s
id
="
N26F4C
">hinc motus ab A ad C indicabitur tardior; </
s
>
<
s
id
="
N26F50
">at ve
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AC ad O videbitur velocior; </
s
>
<
s
id
="
N26F56
">quia credetur confeciſſe arcum maiorem
<
lb
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NK, æquali ſcilicet tempore, quo AN; </
s
>
<
s
id
="
N26F5C
">hinc ab A ad C, id eſt ab apogæo
<
lb
/>
dicitur eſſe tardior; vel ocior verò AC ad I, id eſt ad perigæum, ſed hæc
<
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ſunt facilia, & communia, per quæ explicantur anomaliæ, & inæquali
<
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tates ſimpliciores motuum cæleſtium. </
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>
</
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<
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id
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type
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<
s
id
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N26F68
">Secundò, ſi voluatur circulus radio AE circa centrum E, nec ſit vllus
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motus circa centrum B; haud dubiè omnes partes excentrici ADOC
<
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mouebuntur motu circulari ſed inæquali, vt patet. </
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>
</
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<
p
id
="
N26F70
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type
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main
">
<
s
id
="
N26F72
">Tertiò, ſi ſit motus circularis circa vtrumque centrum; certè centrum
<
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B circumagetur per circellum BGHF, punctum verò A excentrici
<
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deſcribet hanc lineam APIQBSIRA, vt conſtat ex dictis Th. 30.
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num. </
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<
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id
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">30. </
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