From *The Skeptical Review*, 1999 / May-June:
by Farrell Till
Anachronisms occur in written documents when they make references to anything (persons, places, events, etc.) that did not belong to the era in which the documents were set. If a history of the Civil War made references to aerial bombardments and said that Thomas Jefferson was the president at this time, these would be anachronisms, because airplanes didn't exist then and Jefferson was president 50 years earlier. Anyone seeing such references in a history book would immediately realize that the writer was poorly informed about some aspects of this war. Certainly, no one would consider the author to be an infallible writer.