Philosophiae Naturalis Principia Mathematica, Vol. 4 (Classic Reprint) - Softcover

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Excerpt from Philosophiae Naturalis Principia Mathematica, Vol. 4

Si extrà Solis actionem Luna motus suos ageret, Luna ellipsim quam libet circa Terram describere posset in piano quovis, et ea ellipsis perpetuò eadem meneret constantemque angulum cum eclipticfi eflìceret; itaque tota theoria Lume circa haec versaretur demente, primò, ut ex tempore quod Luna consumeret ut a quàdam stella discedens ad camdem rediret, obtine atur duratio ejus mensis periodici siderei sicque motus ejus.medius deter minetur, unde facile obtinebitur via quam Luna dato tempore per eum matum medium emetiri potest, ita ut, datà epochà, hoc est, dato loco caeli in quo Luna aliquando observata fuisset, inde quem in locum migrare debuisset, dato tempore, per medii motus calculam inveniri posset.

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