ABSTRACT
An omen is a clearly defined perception understood as a sign pointing to futureevents whenever it manifests itself under identical circumstances. The classification of a perception as ominous is based on an epistemological development which establishes a normative relationship between the perceived and the future. This classification process is preceded by a period of detailed examination and is thus initially built on empirical knowledge. Omina only cease to be detected empirically when a firm conceptual link has been established between the observed and the future which then allows omina to be construed by the application of regularities. In the Mesopotamian written sources from the first and second millennia BC, omina based on regularities far exceed those based on empirical data. Mesopotamian scholars generally collected data without formally expressing the fundamental principles behind their method. It was the composition of non-empirical omina as such which allowed students to detect the regularities on which they were based without this formulated orally or in writing. Modern attempts at a systematic investigation of such principles however, are still outstanding.
