This article will explore the ways in which early twentieth century physics informs and sustains Gaston Bachelard’s writing on epistemology and time. By investigating the scientific underpinnings of Bachelard’s philosophy of time, this article will also establish a connection between his epistemological and temporal works that are underdeveloped in the secondary literature. This discussion will seek to prove an epistemological commitment, scattered throughout Bachelard’s work on science, in which all epistemological claims are beholden to the claims of modern science. It (...) will be demonstrated how this epistemological claim is implemented in Bachelard’s work on time—specifically, the ways in which relativity theory and microphysics influences his philosophy of time. Such an approach will bridge the gap between Bachelard’s epistemological writings and his work on time while simultaneously illustrating the ways in which physics influences his thinking. (shrink)