Retrodiction (or postdiction, though this shouldn't be confused with the use of the term in criticisms of parapsychological research)'s the act of making a "prediction" about the past. This's especially useful when one wishes to test a theory whose actual predictions are too long-term to be of immediate use. One speculates about uncertain events in the more distant past so that the theory would've predicted a known event in the less distant past. This's useful in, for example, the fields of arch… (More on Retrodiction)