It was first published in German in 1916 and later translated into English in 1920. It is divided into three parts, the first dealing with special relativity, the second dealing with general relativity, and the third dealing with considerations on the universe as a whole. There have been many versions published since the original in 1916, the latest being in 2015. The 2015 publication by Princeton University Press, is billed as the 100th Anniversary Edition, and was issued as an e-book in 2019.