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STS-115 Atlantis long countdown to launch (launch status check at 3:03) (video private as of 4/7/24) Space Shuttle STS-114 Launch Final Poll ; Go For Launch Part 1 of 2 (2 examples launch director's poll) (video private as of 2/23/24) Go For Launch Part 2 of 2 (example final readiness poll) (video private as of 2/23/24)
Countdown clock at NASA's Kennedy Space Center at L-11 hours (28 April 2011) of STS-134, Space Shuttle Endeavour. The launch weather guidelines involving the Space Shuttle and expendable rockets are similar in many areas, but a distinction is made for the individual characteristics of each.
After this point through to T-31 seconds, they are in charge of implementing a manual hold if necessary. After T-31 seconds only an automatic cutoff is available. The automatic cutoff recycles the countdown clock to T-20 minutes. Usually this will extend the launch time beyond the launch window causing a scrub and a 24-hour turnaround.
SpaceX is set to launch its first astronaut crew into orbit Wednesday afternoon, a flight that marks the return of human spaceflight from U.S. soil for the first time in nearly a decade.
A large illuminated digital countdown clock and a flagpole flying an American flag on the edge of the turning basin have often been included in television coverage and launch photos. Before a launch, the clock counts down, showing the remaining time until T-zero in hours, minutes and seconds (–00:00:00).
The MET-clock is set to zero at the moment of liftoff and counts forward in normal days, hours, minutes, and seconds. For example, 2:03:45:18 MET means it has been 2 days, 3 hours, 45 minutes, and 18 seconds since liftoff. [1] [2] MET was formerly called Ground Elapsed Time (GET) prior to the Space Shuttle. [3]
A built-in hold is a period in a launch countdown during which no activities are scheduled and the countdown clock is stopped. The hold serves as a milestone in the countdown, an opportunity for non-launch activities (such as a shift change or meal break), and a chance to perform unanticipated activities such as equipment repair.
The CIF also included the Central Timing Facility, where a precision clock drove countdown clocks and other timing devices at KSC that required a high degree of accuracy. The CIF also housed computers and other electronic equipment for reduction of telemetry data, analysis, and transmission to other NASA centers.