Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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MATHEMATICA. LIB. IV. CAP. XXI,
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mutatâ gravitate, in Telluris ſuperficie, parte {1/2871485}, aqua
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elevatur pedibus 8,95. </
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<
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">ideò, ſi gravitas parte {1/91524}
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tur, elevatio foret pedum 280,7, ut regulâ aureâ detegitur:
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">ſi, ſervatâ hac diminutione gravitatis, de corpore minori a-
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gatur, minuenda eſt hæc altitudo in ratione diametri; </
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<
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ex actione Telluris, elevatio in Lunâ eſt pedum 76,8.</
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æquilibrium non dabitur, ſi Luna ſit bomogenea, niſi axis
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">1433.</
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ſphæroidis ſuperet diametrum ad bunc perpendicularem pe-
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dibus 153,60.</
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">Unicâ proportione detegitur, ex notâ elevatione Maris
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ex Lunæ actione, elevatio in Lunâ ex Telluris actione; </
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ſunt hæ elevationes in ratione duplicatâ inverſâ gravitatum
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in ſuperficiebus illorum corporum.</
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<
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">Si, poſitâ hac Lunæ figurâ, partes cohærere concipiamus,
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æquilibrium inter Lunæ partes non dabitur, niſi axis ſphæ-
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roidis ad Tellurem dirigatur; </
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eandem faciem ſemper Telluri obvertat; </
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tatione, Luna tandem acquiſivit motum circa axem, de quo
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antea egimus : </
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tur, in quo Luna revolvitur; </
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ad celeritatem talem neceſſariò conſtituit; </
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ret celeritas, vi, quâ eadem facies ad Tellurem ſemper di-
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rigitur, continuò retardaretur; </
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minor foret. </
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">Vis tamen hæc non eſt ſatis magna, ut in ſin-
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gulis revolutionibus æquabilitatem motus acquiſiti circa
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axem ſenſibiliter turbet: </
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licèt motu inæquali in orbitâ moveatur Luna . </
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axis Lunæ, non vi memoratâ ita poteſt mutari, ut ad Planum
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orbitæ, dum hujus inclinatio mutatur , ſemper
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cularis ſit, idcircò ad Planum orbitæ aliquando inclinatur
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axis Lunæ, ut antea vidimus .</
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