Benedetti, Giovanni Battista de
,
Io. Baptistae Benedicti ... Diversarvm specvlationvm mathematicarum, et physicarum liber : quarum seriem sequens pagina indicabit ; [annotated and critiqued by Guidobaldo Del Monte]
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EPISTOLAE.
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0233
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<
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style
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xml:space
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">Inctrumentum adortum, & occaſum Lunacognoſcendum
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qualibet anni die.</
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>
<
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">AD EVNDEM.</
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s
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xml:space
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">ECce tibi vir Illuſtriſs.
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<
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conficiendi
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type
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">conficiẽdi</
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inſtrumenti nuper à me
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type
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>
, vt tibi ſi
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gnificaui, quo ſcire poſſis fermè in dies, qua hora (de aſtronomicis loquor) ad
<
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determinatum parallelum & abſque multa ſupputatione, etiam abſque Aſtrolabio
<
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/>
Luna oriatur
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. </
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xml:space
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">In quo inſtrumento poteris etiam videre quo in ſigno Sol,
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& ſæpius itidem Luna permeat, & huiuſce aſpectus cum Sole, atque longitudinem
<
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/>
diei
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="
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type
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toto anni tempore exactè diſcernere.</
s
>
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<
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<
s
xml:id
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xml:space
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">Circularis lamina ex argento, aut ære, aliaúe materia paranda eſt, in cu-
<
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/>
ius ſuperficie ambarum facierum Zodiacus delineabitur, modo inferius depicto,
<
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/>
deinde pro anno quinque circuli ſibi inuicem
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, at reſpectu Zodiaci excen
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trici cęlabuntur in ea, adeo vt vtriuſque centri diſtantia ſit pro .32. parte ſemidia-
<
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/>
metri concauitatis Zodiaci è regione locis augis, temporis qui noſtra ætate circa ſi-
<
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/>
nem ſecundi gradus cancri inuenitur, eandem viam, in hoc, ſequuti, quam Stofle-
<
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rus in dorſo Aftrolabij docet. </
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>
<
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xml:space
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">At nomina menſium media ponantur inter duos
<
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maiores circulos, poſtea inter ſecundum, & tertium ab vna facierum laminæ, ar-
<
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/>
cus ſemidiurni, ab altera vero arcus ſeminocturni, per quinos quoſque dies collo-
<
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centur, ita exactè, vt hic ſubtus videbis. </
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>
<
s
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xml:space
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">adeo vt numeri dierum & ipſorum dierum
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ſigna ſint in interuallis vicinioribus centro communi dictorum quinque circulorum.</
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<
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">Poſteaquam ab vna & altera
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laminæ hæc inſculpra fuerint, aliæ duæ circu
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lares laminæ, magnitudinis ſemidiametri minimi quinque circulorum accipiantur:
<
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</
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<
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xml:space
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">quarum vna pro ortu, & altera pro occaſu Lunæ deſeruiet. </
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<
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xml:space
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">In qualibet ipſarum
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circuli quatuor, eo modo qui paulo inferius cernitur, quos omnes diui-
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demus in triginta ſpacia æqualia: </
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>
<
s
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xml:space
="
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">& in interuallo
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type
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inter duos primos circulos poſi
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tum eſt, triginta dies
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qui ipſos Lunætriginta dies
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, vt in figara.</
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<
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<
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xml:space
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">Poſtmodum in lamina quæ ortus Lunæ indicabit, ac duorum maiorum
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type
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rũ</
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interuallo è regione numeri .1. videlicet primi diei, ponemus horas .12. & minuta
<
num
value
="
48
">.
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48.</
num
>
ex aduerſo diei ſecundi ho .13. et min .36. ex oppoſito tertij ho 14. min .24. & ſic
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ſucceſſiuè augendo per min .48. & indicem è diuerſo diei .30.
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, qui coitus
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Lunæ cum Sole ſigniſicabit: </
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>
<
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xml:space
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">atque lineas aſpectuum, vt inferius videre eſt facilè in
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ueniemus.</
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<
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<
s
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xml:space
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">Altera in lamina quæ occaſum Lunæ indicabit, poſtquam diſtincta fuerit, vt alte-
<
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ra .30. dies ac cęteræ lineæ, eo modo quo in ſuperiori collocabuntur, at numeri in-
<
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/>
terualli maioris, aliter diſponentur, vt potè ex aduerſo diei primi ſolum .48. minu-
<
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/>
ta deſcribi debent, è directo ſecundi diei ponenda erit hora vna cum minutis .36. &
<
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è regione tertij inſcribentur .2. horæ, & min .24. & ſic ex ordine per .48. minuta au-
<
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gendo.</
s
>
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<
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>
<
s
xml:id
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xml:space
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">Nunc lamina ortus Lunę, cum anno arcuum ſeminocturnorum, & illa occaſus cum
<
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anno arcuum ſemidiurnorum
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debet, & ita noſtrum inſtrumentum perfe-
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ctum erit & abſolutum.</
s
>
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<
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>
<
s
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xml:space
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">Quoties igitur voluerimus medio inſtrumento dignoſcere fermè in tali orizonte
<
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qua hora Luna oriatur, ita neceſſe erit volubilem rotam ortus flectere, ut index ve
<
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niat è regione diei menſis in quo talis operatio fit & talirota ſirma manente perſpi- </
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