Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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pore æſtivo matutinos, ad
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Plymuthum
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quidem altitudine quaſi
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pedis unius, ad
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Briſtoliam
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vero altitudine quindecim digitorum:
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obſervantibus
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Colepreſſio
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&
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Sturmio
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.</
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<
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>Motus autem hactenus deſcripti mutantur aliquantulum per vim
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illam reciprocationis aquarum, qua Maris aſtus, etiam ceſſantibus Luminarium actionibus, poſſet aliquam diu perſeverare.</
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<
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>Conſer
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vatio hæcce motus impreſſi minuit differentiam æſtuum alterno
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rum; & aſtus proxime poſt Syzygias majores reddit, eoſque pro
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xime poſt Quadraturas minuit.</
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<
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>Unde ſit ut æſtus alterni ad
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Ply
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muthum & Briſtoliam
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non multo mafis differant ab invicem quam
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altitudine pedis unius vel digitorum quindecim; utque æſtus om
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nium maximi in iiſdem portubus, non ſint primi a Syzygiis, ſed
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tertii.</
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<
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>Retardantur etiam motus omnes in tranſitu per vada, adeo
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ut æſtus omnium maximi, in fretis quibusdam & Fluviorum oſtiis,
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ſsint quarti vel etiam quinti a Syzygiis.</
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Porro fieri poteſt ut æſtus propagetur ab Oceano per freta di
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verſa ad eundem portum, & citius tranſeat per aliqua freta quam
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per alia: quo in caſu æſtus idem, in duos vel plures ſucceſſive ad
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venientis diviſus, componere poſſit motus novos diverſorum ge
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nerum.</
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<
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>Fingamus æſtus duos æquales a diverſis locis in eundem
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portum venire, quorum prior præcedat alterum ſpatio horarum
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fex, incidatQ.E.I. horam tertiam ab appulſu Lunæ ad Meridia
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num portus.</
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<
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>Si Luna in hocce ſuo ad Meridianum appulſu ver
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fabatur in æquatore, venient ſingulis horis fenis æquales affluxus,
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qui in motuos refluxus incidendo eoſdem affluxibus æquabunt,
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& ſic ſpatio diei illius efficient ut aqua tranquille ſtagnet.</
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<
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>Si
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Luna tunc declinabat ab Æquatore, fient æſtus in Oceano vici
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bus alternis majores & minores, uti dictum eſt; &inde propaga
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buntur in hunc portum affluxus bini majores & bini minores, vi
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cibus alternis.</
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<
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>Affluxus autem bini majores component aquam
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altiſſimam in medio inter utrumque, affluxus major & minor fa
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ciet ut aqua aſcendat ad mediocrem altitudinem in Medio ipſo
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rum, & inter affluxus binos minores aqua aſcendet ad altitudi
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dinem minimam.</
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<
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>Sic ſpatio viginti quatuor horarum, aqua non
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bis ut fieri ſolet, sed ſemel tantum perveniet ad maximam altitu
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dinem & ſemel ad minimam; & altitudo maxima, ſi Luna decli
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nat in polum ſupra Horizontem loci, incidet in horam vel ſextam
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vel triceſimam ab appulſu Lunæ ad Meridianum, atque Luna de
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clinationem mutante mutabitur in defluxum.</
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<
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>Quorum omnium
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exemplum, in portu regni
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Tunquini
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ad
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Batſham
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, ſub latitudine</
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