Many leading scientist such as Halley and Leibniz had attempted to give an explanation but all had failed to understand the main cause of the variation.
Maraming mga nangungunang siyentipiko tulad ng Halley at Leibniz had tinangka upang magbigay ng paliwanag ngunit lahat ay nabigo na maunawaan ang mga pangunahing sanhi ng pagkakaiba-iba.