In 1907, laga bilaabo tijaabo fekerka fudud oo ku lug leh kormeeraha ee free dhac, uu bilaabay on waxa uu noqon lahaa raadinta sideed sano ah ee aragtida ah relativistic ah ee cuf. Ka dib markii wareegyo badan iyo bilaabashada been ah, uu shaqada culminated in soo bandhigidda in Academy Prussian ee Sayniska ee November 1915 waxa hadda loo yaqaan Einstein field sinnaanta. sinnaanta kuwan qeexan sida geometry ee meel iyo waqti waxaa saameeya wax kasta oo maaddada iyo shucaaca ay joogaan, iyo foomka asaasiga ah ee Einstein ee aragtida guud ee relativity.
Sanadkii 1919