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Efficiendum est ut corpus in Trajectoria quacun{que} circa centrum viri∣um revolvente perinde moveri possit, at{que} corpus aliud in eadem Trajectoria quiescente.
In Orbe VPK positione dato revolvatur corpus P pergendo a V versus K. A centro C agatur semper Cp, quae sit ipsi CP ae∣qualis, angulum{que} VCp angulo VCP proportionalem constitu∣at; & area quam linea Cp describit erit ad aream VCP quam li∣nea
CV, at{que} figura vCp figurae VCP aequalis, & corpus in p semper existens movebitur in perimetro figurae revolventis vCp, eodem{que} tempore describet arcum ejus vp quo corpus aliud P arcum ipsi similem & aequalem VP in figura quiescente VPK de∣scribere potest. Quaeratur igitur, per Corollarium Propositionis VI, vis centripeta qua corpus revolvi possit in curva illa linea quam punctum p describit in plano immobili, & solvetur Proble∣ma. Q.E.F.