In this he assumed that the three bodies lie in the same plane, that two bodies orbited their common centre of mass, and that the third body orbited the other two but it was assumed to be of negligible mass so did not affect the orbits of the two (assumed massive) bodies.
Sa ito siya assumed na ang tatlong katawan magsinungaling sa parehong eroplano, na dalawang katawan orbited kanilang karaniwang mga sentro ng masa, at ang ikatlong katawan orbited ang iba pang dalawang ngunit ito ay assumed na napakababa ng masa kaya hindi makakaapekto sa orbits ng dalawang (assumed malawakang) katawan.