In 1672 Hooke attempted to prove that the Earth moves in an ellipse round the Sun and six years later proposed that inverse square law of gravitation to explain planetary motions.
Sa 1672 Hooke tinangka upang patunayan na ang Earth inililipat sa isang tambilugan round ng Linggo at anim na taon mamaya iminungkahi na kabaligtaran square batas ng grabitasyon na ipaliwanag pamplaneta motions.