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Doomsday Clock. The Doomsday Clock is a symbol that represents the likelihood of a human-made global catastrophe, in the opinion of the members of the Bulletin of the Atomic Scientists. [1] Maintained since 1947, the Clock is a metaphor, not a prediction, for threats to humanity from unchecked scientific and technological advances.
A countdown is a carefully devised set of procedures ending with the ignition of a rocket's engine. Depending on the type of vehicle used, countdowns can start from 72 to 96 hours before launch time. During countdown: Aerospace personnel bring the rocket vehicle to the launch site and load it with payload and propellants;
A timer or countdown timer is a type of clock that starts from a specified time duration and stops upon reaching 00:00. A simple timer is an hourglass. Commonly, a timer triggers an alarm when it ends. A timer can be implemented through hardware or software. Stopwatches operate in the opposite direction, upwards from 00:00, measuring elapsed ...
H-Hour. The specific time at which an operation or exercise commences, or is due to commence (this term is used also as a reference for the designation of days/hours before or after the event). (NATO); also known as 'Zero Hour'. I-Day. Used informally within the U.S. military bureaucracy to variously designate the "Implementation Day" or the ...
System time. In computer science and computer programming, system time represents a computer system's notion of the passage of time. In this sense, time also includes the passing of days on the calendar. System time is measured by a system clock, which is typically implemented as a simple count of the number of ticks that have transpired since ...
Please note the following important points before using this template. The time on this countdown clock is GMT (UTC+0) Duration is in seconds, so duration=3600 for a one-hour event. Alternatively, duration and duration unit=//unit// can be used in unison (e.g., duration=1|duration unit=year ). This template should not be used in articles per ...
One hour run. The one hour run is an athletics event in which competitors try to cover as much distance as possible within one hour. While officially recognized by World Athletics as a track event, it is rarely contested apart from occasional world record attempts. The event has a long history, with first recorded races dating back to the late ...
10:28:25: The North Tower of the World Trade Center collapses, 1 hour and 42 minutes after the impact of Flight 11. The Marriott Hotel, located at the base of the two towers, is also destroyed. [1] [3] 10:50:19: All five stories of the Pentagon on the West side where American 77 crashed collapsed due to the fire started by the crash.
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