Big History is a seemingly novel approach that seeks to situate human history within a grand cosmic story of life. It claims to do so by uniting the historical sciences in order to construct a linear and accurate timeline of 'threshold moments' beginning with the Big Bang and ending with the present and future development of humanity itself. As well as examining the theory and practice of Big History, this Element considers Big History alongside previous largescale attempts to unite human and natural history, and includes comparative discussions of the practices of chronology, universal history, and the evolutionary epic.