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Moveatur corpus in circulo PQA: ad hunc effectum requiritur lex vis centripetae tendentis ad punctum adeo longinquum, ut lineae om∣nes PS, RS ad id ductae, pro parallelis haberi possint.
A circuli centro C agatur semidiameter CA parallelas istas per∣pendiculariter secans in M & N, & jungantur CP. Ob similia triangula CPM, & TPZ, vel
Et simili argumento corpus movebitur in Ellipsi vel etiam in Hyperbola vel Parabola, vi centripeta quae sit reciproce ut cu∣bus ordinatim applicatae ad centrum virium maxime longinquum tendentis.