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Re: SpaceX launch live coverage
Quote:
Originally Posted by wireties
FYI - the countdown is not supposed to be a linear temporal scale. It is more of a reverse progress indicator (lower number = more progress towards lift-off) . Certain activities occur at each point in the countdown and there is little correlation to clock time. At least that is how NASA did things.
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You are thinking of the "T-" clock vs the "L-" clock. NASA, ULA, etc use both clocks and use T- is the context you describe with built-in holds. However the L- clock represents time from planned engine ignition.
SpaceX did away with the T- clock and uses only the L- (and calls it T-). Although events are sequenced based on clock times, there's no scheduled clock holds and the clock really should be treated like time left until nominal ignition.
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