Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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              cum nullam ejus ſenſibilem imminutionem, vel in altiſſimis montium
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              cacuminibus, obſervare licet. </s>
              <s>Gravitat itaque Luna in Terram:
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              quin & actione mutua, Terra viciſſim in Lunam æqualiter gravitat:
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              id quod abunde quidem confirmatur in hac Philoſophia, ubi agi­
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              tur de Maris æſtu & Æquinoctiorum præceſſione, ab actione tum
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              Lunæ tum Solis in Terram oriundis. </s>
              <s>Hinc & illud tandem edo­
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              cemur, qua nimirum lege vis Gravitatis decreſcat in majoribus a
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              Tellure diſtantiis. </s>
              <s>Nam cum Gravitas non diverſa ſit a Vi cen­
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              tripeta Lunari, hæc vero ſit reciproce proportionalis quadrato
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              diſtantiæ; diminuetur & Gravitas in eadem ratione. </s>
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              <s>Progrediamur jam ad Planetas reliquos. </s>
              <s>Quoniam revolu­
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              tiones primariorum circa Solem & ſecundariorum circa Jovem &
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              Saturnum ſunt Phænomena generis ejuſdem ac revolutio Lunæ
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              circa Terram, quoniam porro demonſtratum eſt vires centripetas
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              primariorum dirigi verſus centrum Solis, ſecundariorum verſus
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              centra Jovis & Saturni, quemadmodum Lunæ vis centripeta verſus
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              Terræ centrum dirigitur; adhæc, quoniam omnes illæ vires ſunt
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              reciproce ut quadrata diſtantiarum a centris, quemadmodum vis
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              Lunæ eſt ut quadratum diſtantiæ a Terra: concludendum erit
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              eandem eſſe naturam univerſis. </s>
              <s>Itaque ut Luna gravitat in Ter­
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              ram, & Terra viciſſim in Lunam; ſic etiam gravitabunt omnes
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              ſecundarii in primarios ſuos, & primarii viciſſim in ſecundarios;
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              ſic & omnes primarii in Solem, & Sol viciſſim in primarios. </s>
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              <s>Igitur Sol in Planetas univerſos gravitat & univerſi in Solem. </s>
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              Nam ſecundarii dum primarios ſuos comitantur, revolvuntur in­
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              terea circum Solem una cum primariis. </s>
              <s>Eodem itaque argumento,
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              utriuſque generis Planetæ gravitant in Solem, & Sol in ipſos. </s>
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              Secundarios vero Planetas in Solem gravitare abunde inſuper
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              conſtat ex inæqualitatibus Lunaribus; quarum accuratiſſimam
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              Theoriam, admiranda ſagacitate patefactam, in tertio hujus Operis
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              libro expoſitam habemus. </s>
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              <s>Solis virtutem attractivam quoquoverſum propagari ad ingen­
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              tes uſQ.E.D.ſtantias, & ſeſe diffundere ad ſingulas circumjecti ſpa­
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              tii partes, apertiſſime colligi poteſt ex motu Cometarum; qui ab
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              immenſis intervallis profecti feruntur in viciniam Solis, & non­
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              nunquam adeo ad ipſum proxime accedunt ut Globum ejus, in
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              Periheliis ſuis verſantes, tantum non contingere videantur. </s>
              <s>Ho­
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              rum Theoriam ab Aſtronomis antehac fruſtra quæſitam, noſtro
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              tandem ſæculo feliciter inventam & per Obſervationes certiſ­
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              ſime demonſtratam, Præſtantiſſimo noſtro Auctori debemus. </s>
              <s>Patet </s>
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