The Countdown Begins

Last night, the countdown to the launch of STS-117 began. See coverage of the start of countdown via NASA SpaceFlight and Spaceflight Now. Also, the latter site has a handy countdown chart, and NASA provides a real-time clock and a mission clock which “begins 43 hours before launch and mirrors the real clock by pausing during the various built-in holds during the countdown”. Launch is scheduled for 19:38 (7:38 PM) Eastern time on 08 June.