Theories predicting the direction of the stock market have been popular since stocks were traded under the buttonwood tree, on a street in lower Manhattan, which eventually became Wall Street. Some theories include: the Super Bowl Theory, the January Theory, and the Hemline Theory.
Source - http://www.econ101.com/hermes/Newsletters/nl2002sp2.html
During the period of September 11th through September 17th 2001, Hermes Econometrics remained open to collect data, monitor markets, implement trades on behalf of clients, and was available to respond to any concerns of investors and brokers.
Source - http://www.econ101.com/hermes/Newsletters/nl2001fl2.html