Vitruvius
,
De architectura libri decem
,
1567
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motus, prœcedit lineam ueri motus. </
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<
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xml:space
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">Sed cum ſemicirculus tranſit, tunc linea ueri, lineam medij motus prœ-
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cedit, ideo ſuperius demitur, inferius additur medio motui, ut uerus eliciatur. </
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<
s
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xml:space
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<
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xml:space
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d. eius centrum.
<
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e z b. eccentricum.
<
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t. eius centrum.
<
lb
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k z. epicyclus.
<
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b. eius centrum.
<
lb
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d t. b z. œquales.
<
lb
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t z. d b. œquales.
<
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motus { concentrici b d a. \\ epicycli k b z. \\ eccentrici z t e. \\ anguli œquales
<
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Sol utroque modo uidetur in z. per li-
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neam d z.</
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culationem uenire, cum iam me
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pœniteat ultra progreſſum. </
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<
s
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xml:space
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licet omnia doctiſſime a Franciſco
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Maurolico explicentur. </
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<
s
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xml:space
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aduertendum, quod aliquo in it io
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statuenda eſt radix ( ita enim ap-
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pellant, unde aliquod initium ſumi-
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mus medij motus ) a qua ſtatim cũ
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uolumus, medium ſolis motum nu-
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merare poſſimus, ex qua radice
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uerus motus obſeruatur per ea,
<
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quæ ad trigonorum planorum ſcien
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tiam ſpectant. </
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<
s
xml:id
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xml:space
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tria centra iungentibus, ſcilicet
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orbis, deferentis, & </
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s
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xml:space
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">Solis, tres an-
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guli in trigono constituuntur quo-
<
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rum unus eſt œquationis angulus, uerum alij duo ſunt, qui duas lineas effingunt, unam ueri, alterã medij mo-
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tus unà cum linea iugi. </
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<
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xml:space
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">& </
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<
s
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xml:space
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">cum nobis nota fuerit ea proportio, quam inter ſe babent duo latera iam conſti-
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fig-514.01.321-02a
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130
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<
description
xml:id
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xml:space
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">a b g. eccentricum.
<
lb
/>
d. eius centrum.
<
lb
/>
e. centrum mundi.
<
lb
/>
a d g. linea ingi.
<
lb
/>
b. centrm Solis.
<
lb
/>
e z. linea medij motus parallela li-
<
lb
/>
neœ b d.
<
lb
/>
c b. linea ueri motus.
<
lb
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b e z. angulus œquatio.</
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tuti trigoni, è quibus unum est
<
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eccentrici ſemidiameter, & </
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<
s
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xml:space
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terum ſpatium illud, quod a cen
<
lb
/>
tro exit, conſequitur ut propo-
<
lb
/>
ſito quouis angulo è tribus,
<
lb
/>
etiam alij manifesti ſint. </
s
>
<
s
xml:id
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xml:space
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">Qua-
<
lb
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re colligimus, quod dato aut me
<
lb
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dio motu, aut uero, aut æqua-
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tione per ſe, quanto citius unũ,
<
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<
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aut alterum nouerimus, facile
<
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& </
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<
s
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xml:space
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">reliqui duo cognoſcentur.
<
lb
/>
</
s
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<
s
xml:id
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xml:space
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">Hœc omnia dicta ſunt, & </
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<
s
xml:id
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xml:space
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">inuen
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ta, ut uiſiones, quas apparen-
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tias uocant, & </
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>
<
s
xml:id
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xml:space
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">irregularitatem Solis circa centrum orbis ſeruemus. </
s
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<
s
xml:id
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xml:space
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">& </
s
>
<
s
xml:id
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xml:space
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">ut certa, ac determinata ratio ipſius
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motus firmetur, omneq́; </
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>
<
s
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xml:space
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">id ſubſcripta docet figura, per o literam ſignata. </
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<
s
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xml:space
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preserve
">Postquam de Sole dictum
<
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131
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<
description
xml:id
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xml:space
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preserve
">a b g. concentricum. d. eius centrũ.
<
lb
/>
t z. eccentricum.
<
lb
/>
h. eius centrum.
<
lb
/>
e z. epicyclus.
<
lb
/>
g. eius centrum.
<
lb
/>
d b. & g z. œquales.
<
lb
/>
d z. parallelogrammum.
<
lb
/>
motus {concentrici a d g. \\ epicycli e g z. \\ eccentrici t b z. uet t dg. \\ iugieccentric. a d t.
<
lb
/>
anguli t b z. & e g z. œqua-
<
lb
/>
les ſunt.
<
lb
/>
angulus a d g. œqualis augulis. {adt. \\ adg.</
description
>
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est, de Luna dicendum eſt, deq́;
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</
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<
s
xml:id
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xml:space
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">eius motionis diuerſitate, & </
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<
s
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xml:space
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ro ipſius loco. </
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<
s
xml:id
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xml:space
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">Dico igitur ue-
<
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rum Lunæ locum ex eius defe-
<
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<
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xlink:href
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note-514.01.321-04a
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xml:space
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">40</
note
>
ctu deprebendi. </
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<
s
xml:id
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xml:space
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conſider at initium & </
s
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<
s
xml:id
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xml:space
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">finem de-
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fectus Lunœ, etiam medium in-
<
lb
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stans habet, in quo Luna toto
<
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/>
diametro Soli obijcitur, quare
<
lb
/>
cum ex ſupra poſitis Solis mo-
<
lb
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tio nota ſit, non eſt quod dubi-
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lb
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temus uerum Lunœ locum per-
<
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pendere. </
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<
s
xml:id
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xml:space
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<
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Lunœ motu ea cernhur, quod in
<
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<
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note-514.01.321-05
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xlink:href
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note-514.01.321-05a
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xml:space
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note
>
eodem ſigniferi loco non ſem-
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per œque uelociter mouetur, & </
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<
s
xml:id
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xml:space
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<
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uarijs modis ſe babet ad Solem,
<
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/>
quare cum barum diuer ſitatum rationem reddere uellent, primam epicyclo, alteram eccentrico dedere. </
s
>
<
s
xml:id
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xml:space
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">Qua-
<
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tuor in epicyclo puncta ſunt, in uno celerrime Luna mouetur, quoniam eccentricum cum epicyclo in motu
<
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conueniunt, & </
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>
<
s
xml:id
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xml:space
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">ad unam eandemq́; </
s
>
<
s
xml:id
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xml:space
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">partem feruntur. </
s
>
<
s
xml:id
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echoid-s21955
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xml:space
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">Sed in oppoſito tardiſſima eſt, nam epicyclo eccentricum
<
lb
/>
contra nititur, ſed inter duo media puncta ſatis moderatè mouetur. </
s
>
<
s
xml:id
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echoid-s21956
"
xml:space
="
preserve
">Huiuſmodi quatuor puncta ita epicyclum
<
lb
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distribuunt, quod in prima parte celerrima fit, & </
s
>
<
s
xml:id
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xml:space
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">citiſſima eius motio, in ſecunda remittitur, in tertia tardiſ-
<
lb
/>
ſime fertur, in quarta demum temperatè cietur. </
s
>
<
s
xml:id
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echoid-s21958
"
xml:space
="
preserve
">huiuſmodi ob diuerſitatem deprebendimus quibus in parti-
<
lb
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bus epicycli Luna moueatur, & </
s
>
<
s
xml:id
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xml:space
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">quanto temporis interuallo circum epicyclum uoluatur, & </
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<
s
xml:id
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xml:space
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">ut ad unguem
<
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<
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xlink:label
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xlink:href
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note-514.01.321-06a
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xml:space
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">60</
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>
tempus illud colligerent ſyderum obſeruatores, geminos Lunæ defectus ſumpſere, in quibus Luna ſimiliter, &</
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