Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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<
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>Quo temporis ſpatio vapor a capite ad terminum caudæ aſcen</
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dit, cognoſci fere poteſt ducendo rectam a termino caudæ ad So
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lem, & notando locum ubi recta illa Trajectoriam ſecat. </
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<
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>Nam
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vapor in termino caudæ, ſi recta aſcendat a Sole, aſcendere cœpit
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a capite quo tempore caput erat in loco interſectionis. </
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<
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>At vapor
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non recta aſcendit à Sole, ſed motum Cometæ, quem aute aſcen
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ſum ſuum habebat, retinendo, & cum motu aſcenſus ſui eundem
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componendo, aſcendit oblique. </
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<
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>Unde verior erit Problematis
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ſolutio, ut recta illa quæ Orbem ſecat, parallela ſit longitudini
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caudæ, vel potius (ob motum curvilineum Cometæ) ut eadem a
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linea caudæ divergat. </
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<
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>Hoc pacto inveni quod vapor qui erat in
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termino caudæ
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Jan.
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25, aſcendere cœperat a capite ante
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Dec.
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11,
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adeoque aſcenſu ſuo toto dies plus 45 conſumpſerat. </
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<
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>At cauda
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illa omnis quæ
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Dec.
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10 apparuit, aſcenderat ſpatio dierum illo
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rum duorum, qui a tempore Perihelii Cometæ elapſi fuerant. </
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Vapor igitur ſub initio in vicinia Solis celerrime aſcendebat, &
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poſtea cum motu per gravitatem ſuam ſemper retardato aſcen
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dere pergebat; & aſcendendo augebat longitudinem caudæ: cauda
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autem quamdiu apparuit ex vapore fere omni conſtabat qui a
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tempore Perihelii aſcenderat; & vapor, qui primus aſcendit, &
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terminum caudæ compoſuit, non prius evanuit quam ob nimiam
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ſuam tam a Sole illuſtrante quam ab oculis noſtris diſtantiam vi
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deri deſiit. </
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<
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>Unde etiam caudæ Cometarum aliorum quæ breves
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ſunt, non aſcendunt motu celeri & perpetuo a capitibus & mox
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evaneſcunt, ſed ſunt permanentes vaporum & exhalationum co
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lumnæ, a capitibus lentiſſimo multorum dierum motu propagatæ,
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quæ, participando motum illum capitum quem habuere ſub initio,
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per cœlos una cum capitibus moveri pergunt. </
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<
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>Et hinc rurſus col
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ligitur ſpatia cœleſtia vi reſiſtendi deſtitui; utpote in quibus non
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ſolum ſolida Planetarum & Cometarum corpora, ſed etiam rariſ
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ſimi caudarum vapores motus ſuos velociſſimos liberrime peragunt
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ac diutiſſime conſervant. </
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LIBER
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TERTIUS.</
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<
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>Aſcenſum caudarum ex Atmoſphæris capitum & progreſſum in
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partes a Sole averſas
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Keplerus
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aſcribit actioni radiorum lucis ma
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teriam caudæ ſecum rapientium. </
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>Et auram longe tenuiſſimam in
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ſpatiis liberrimis actioni radiorum cedere, non eſt a ratione pror
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ſus alienum, non obſtante quod ſubſtantiæ craſſæ, impeditiſſimis
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in regionibus noſtris, a radiis Solis ſenſibiliter propelli nequeant. </
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Alius particulas tam leves quam graves dari poſſe exiſtimat, &
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materiam caudarum levitare, perque levitatem ſuam a Sole aſcen-</
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