Historical time refers to the progression of human events which have occurred throughout history.
Time values associated with changing patterns of human history are determined on the basis of geochronological time, as well as by the selection and interpretation of human events which have been recorded.
Geochronological data is derived from the geological and fossil records which provide information on conditions of climate, terrain, population, and habitat. In addition, anthropological and archeological findings produce information on various cultural patterns and traditions, including tools and other objects which have been preserved over long periods of time.
Geochronological information is used to trace the events of human history as far back in time as 1.6 million years ago when humans first stood erect.
In addition to geochronological data, human history is mediated by the recording and interpretation of events. The recording and interpretation of human events varies according to the configurations of changing cultures, and depends upon the context in which the events are interpreted.
The problem with historical time is that it must always be accounted for in the present, which produces a unique perspective of the events of history, and results in an extremely varied and often unreliable record of those events.