Space Shuttle launch countdown | Wikipedia audio article
Channel: wikipedia tts
Date: 26/03/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Space_Shuttle_launch_countdown


00:00:59 1 Milestones
00:01:13 1.1 T-43 hours and counting
00:01:58 1.2 T-27 hours and holding
00:02:26 1.3 T-27 hours and counting
00:02:42 1.4 T-19 hours and holding
00:03:10 1.5 T-19 hours and counting
00:03:40 1.6 T-11 hours and holding
00:04:18 1.7 T-11 hours and counting
00:04:39 1.8 T-6 hours and holding
00:05:26 1.9 T-6 hours and counting
00:05:52 1.10 T-3 hours and holding
00:06:49 1.11 T-3 hours and counting
00:07:33 1.12 T-20 minutes and holding
00:07:56 1.13 T-20 minutes and counting
00:08:23 1.14 T-9 minutes and holding
00:08:55 1.15 T-9 minutes and counting
00:09:15 1.16 T-5 minutes and counting
00:10:11 1.17 T-10 seconds and counting
00:10:33 1.18 T-0 seconds



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SUMMARY
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The launch of Space Shuttle missions was governed by a countdown. Two clocks were maintained, the unofficial, but sometimes mentioned, L (launch) clock represented the time remaining before the scheduled launch in real time, and the more often referred to T (test) clock included several built-in holds where additional verifications were made. Built-in holds were extended if mission parameters allowed for additional checks or to correct issues. Launches of the Space Shuttle to the international space station did not allow for holds to be extended due to the launch window which was limited to no more than 10 minutes due to the 90 minute orbit period of the station and speed of Earth's rotation (913.6 miles per hour (1,470.3 km/h) at the Kennedy Space Center), which puts the launch pads 1,000 miles (1,600 km) east of the station on its next orbit.