The left side of the watch is where the "launch aperture" displays three critical phases of the space shuttle's launch
link sequence. The green phase represents the period shortly after the shuttle is processed for flight. This is when the final pre-flight checks occur, and the decision to launch is made by processing
link weather information from The National Weather
link Service, who operate the Spaceflight Meteorology Group. Input is also considered from the U.S. Air Force's 45th Weather Squadron.