Heidegger's History Of The Concept Of Time

History of the Concept of Time, translated by Theodore Kisiel as the English vision and prepared for publication by Petra Jaeger as the German vision, is a course of lectures that Heidegger gave at the University of Marburg during the summer semester 1925. This lecture is the one that Gardamer has called the "original form" of Being and Time, which offers a unique motivation to prompt the writing of this great philosopher's master work and the presuppositions that gave shape to Dasein. In according to History of the Concept of Time, the aim of this paper is try to find what the philosophical environment was before Heidegger wrote the great work Being and Time, why he would like to inquire being, how he found and defined Dasein and how he took "Time" as the guard. The main part of this paper is as followed:The preliminary part is going to discuss the sense and task of phenomenological research. After reviewing the situation of philosophy in the second half of the 19th century, Heidegger decided to inherit and develop Husserl's phenomenology in order to inquire Being. Since he criticized the traditional philosophical research method, he had to redefine the concept of phenomenology by clarifying intentionality, categorial intuition, the original sense of the apriori and the principle of phenomenology. He also criticized some problems during the early development of phenomenological research so that he prepared for inquring Being by phenomenological method and fulfilled the transition from Hussel's "position of consciousness" into Dasein.The main part is started with Heidegger's presupposition of Dasein's priority andthe place where Dasein live--world. He defined the basic constitution of Dasein asbeing-in-the-world, thus the concepts of worldhood, meaning, being-in, anyone etc. come into the discussion because the analysis of Dasein and worldhood cannot be apart. With the concept of Death, Heidegger put all these unorganized concepts together by the concept of Concern, therefore, he finally put forward this guard "Time" when he had to study Dasein as a whole. But he ended the lecture with just pointing that "Dasein is time itself, however, we still can reread this lecture by Time and find this hided clue of Time clearly.