Ot site-a www.goroadachi.com/etemenanki/

"... we seem to have '16' as the key encoded number of the event: Columbia was launched on the 16th day of the month, the mission lasted 16 days, the shuttle broke apart 16 min before landing, etc. And as for what it signifies, it is certainly interesting that January '03 is 16 months away from September 2001..."