Waxaa la ogsoon yahay in Newton uu la tacaalayay dabayaaqadii 1660-yadii fikradda ah in culeyska dhulka uu ku fidsan yahay, oo ku jira qiyaas laba jibbaaran oo ka soo horjeeda, ilaa Dayaxa; si kastaba ha ahaatee wuxuu qaatay labaatan sano si uu u horumariyo aragti buuxa. Su'aashu ma ahayn in culeyska dhulka uu jiray, laakiin haddii uu ka fogaaday Dhulka inuu noqon karo xoogga dayaxa ku haysta meeshiisa. Newton wuxuu muujiyey in haddii xoogga uu hoos u dhacay sida laba jibbaaran ee masaafada, qofku runtii xisaabi karo muddada orbitalka ee dayaxa, oo uu helo heshiis wanaagsan. Wuxuu qiyaasay in isla xooggaas uu mas'uul ka yahay dhaqdhaqaaqyada kale ee orbitalka, sidaas darteedna loo magacaabay "culeyska caalamiga ah". Su'aal: Muxuu yahay fikradda Newton ee culeyska dhulka?
Haddii xoogu yaraado sida isku wareega laba jibbaaran ee masaafada, run ahaantii qofku wuxuu xisaabin karaa waqtiga wareega ee dayaxa