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Timeline of the September 11 attacks. The following timeline is a chronological list of all the major events leading up to, during, and immediately following the September 11 attacks against the United States in 2001, through the first anniversary of the attacks in 2002.
As a result, most of the events listed below were known by a large portion of the world's population as they occurred. The attacks themselves lasted less than two hours; the first hijacking commenced at approximately 8:14 am EST, and the final hijacked plane crashed at 10:03 am EST. All times given are in Eastern Time Zone (EDT), or UTC−04:00.
The order of operations, that is, the order in which the operations in an expression are usually performed, results from a convention adopted throughout mathematics, science, technology and many computer programming languages. It is summarized as: [2] [5] Parentheses; Exponentiation; Multiplication and division; Addition and subtraction
Chronology. Chronology (from Latin chronologia, from Ancient Greek χρόνος, chrónos, 'time'; and -λογία, -logia) [ 2] is the science of arranging events in their order of occurrence in time. Consider, for example, the use of a timeline or sequence of events. It is also "the determination of the actual temporal sequence of past events".
e. In probability theory, an event is a set of outcomes of an experiment (a subset of the sample space) to which a probability is assigned. [ 1] A single outcome may be an element of many different events, [ 2] and different events in an experiment are usually not equally likely, since they may include very different groups of outcomes. [ 3]
The following outline is provided as an overview of and topical guide to World War II : World War II, or the Second World War was a global military conflict that was fought between September 1, 1939, and September 2, 1945. The war pitted two major military alliances against each other: the Allies of the United States, Soviet Union, United ...
The Tenerife airport disaster, the worst accident in aviation history, is a prime example of an accident in which a chain of events and errors can be identified leading up to the crash. [ 9] Pilot error, communications problems, fog, and airfield congestion (due to a bomb threat and explosion at another airport) all contributed to this catastrophe.
A sequence of events recorder (SER) [1] is an intelligent standalone microprocessor based system, which monitors external inputs and records the time and sequence of the changes. [2] [3] They usually have an external time source such as a GPS or radio clock. When wired inputs change state, the time and state of each change is recorded.
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