Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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<
s
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xml:space
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">Nec per ſe quenquam tempus ſentire fatendum eſt
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Semotum ab rerum motu placidáque quiete;</
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<
s
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xml:space
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">Haud malè dixit Lucretius. </
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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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">Philoſophus ipſe; </
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<
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xml:space
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">“Oταν {γρ}
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αὺπὶ μν
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δὲν
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xml:space
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">_Phyſ. IV._ 16.</
note
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μετασ
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άλλωμεν {τὴν} διά@ωιαν, ῆλάθ
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ωμεν μεταβά
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{λλ}ον{τε}ς, {ου} δοκεῖ η
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μῖν {γρ}{γρ}νέναι
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{γρ}éγ{ος}. </
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<
s
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xml:space
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">Re
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ctè quidem hoc, non videtur nobis, non apparet à ſomno
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excitatis quantum temporis interceſſit; </
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<
s
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xml:space
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">at non hinc rectè colligitur,
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Φανε{ρὁ}γ @π {ου}λ {ἐστι}ίν ἄν{εμ} κγ νήσεως {καὶ} μεταβλῆς ὁ {χο}ὁν{ος}. </
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<
s
xml:id
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xml:space
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">Non perſen-
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tiſcimus, ergò non eſt, illatio fallax, & </
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<
s
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xml:space
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">fallax ſomnus, qui fecit ut
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nos duo ſemota temporis inſtantia connecteremus. </
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<
s
xml:id
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xml:space
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">interim veriſſi-
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mum illud; </
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<
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xml:space
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">@{σκ} η
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@ιησις, {το}σ@τ{ος} {καὶ} ό {γρ}όν{ος} ἁ@ δοκεῖ {γρ}{γρ}νέναι,
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quantus nempe motus fuit, tantum tempus videtur extitiſſe; </
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<
s
xml:id
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xml:space
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">neque
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quum tantum tempus dicimus, aliud conſuevimus intelligere, quam
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tantum motum intercedere potuiſſe, cujus ſcilicet extenſioni continuò
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ſucceſſivæ rerum permanentiam imaginamur coëxtendi. </
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<
s
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xml:space
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">Cæterùm quia
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tempus alveo ſemper æquali, non per vices nunc ſegniùs, tunc rapi-
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diùs præterlabi concipimus (admiſsâ ſiquidem illâ diſparitate nullam
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omninò computationem, aut dimenſionem admitteret) non ideò mo-
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tus omnis æquè determinandæ dignoſcendæque temporis quantitati
<
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cenſeatur accommodatus, at is præſertim qui ſummè ſimplex & </
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<
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xml:space
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">uni-
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formis æquabili ſemper tenore progreditur; </
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<
s
xml:id
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xml:space
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">mobili parem ubique
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vim retinente, pérque medium uniforme delato. </
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<
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xml:space
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">Quare tempori de-
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terminando tale quiddam mobile deligendum eſt, quod ſaltem quoad
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motûs ſui periodos æqualem conſtanter impetum ſervat; </
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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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le ſpatium decurrit. </
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<
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xml:space
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">Et ad communem quidem uſum accipiendus
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eſt ejuſmodi motus præcipuè notabilis, in promptu cunctis obvius, & </
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ſenſus omnium incurrens, qualis eſt motus ſyderum, imprimìs _Solis_
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_& </
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<
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xml:space
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">Lunæ_, mirificè ſibi per omnia conſtans, & </
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<
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xml:space
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">orbi terrarum con-
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ſpicuus; </
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<
s
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xml:space
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">qui proinde nedum communi gentis humanæ ſuſſragio de-
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putatus, at divino Creatoris conſilio aptus natus eſt huic uſui; </
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<
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xml:space
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nempe pronunciatum legimus: </
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<
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xml:space
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">_Fiant luminaria in ſirmamento Cæli_,
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_& </
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<
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xml:space
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">dividant diem ac noctem, & </
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<
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, & </
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I. 14.</
note
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_annos._ </
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<
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xml:space
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">At quomodò, dices, cognoſcetur _æquabili ſolem motu ferri,_
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_& </
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<
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xml:space
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">unum puta diem, aut annum alteri penitus exæquari, vel aqui_
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_temporaneum eſſe?_ </
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<
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">Reſpondeo non aliter hoc ( excipiendo quòd à di-
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vino teſtimonio colligatur) nobis innoteſcere, quàm cum aliis æqua-
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libus motibus ipſum ſolis motum contendendo. </
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<
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">Si nempe deprehen-
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datur ſolis motus in horologio ſolari (quod ſpatiorum à ſole in circulis
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æquatori parallelis percurſorum penè eerto ac exquiſitè </
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