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A National Special Security Event ( NSSE) is an event of national or international significance deemed by the United States Department of Homeland Security (DHS) to be a potential target for terrorism or other criminal activity. These events have included summits of world leaders, meetings of international organizations, presidential nominating ...
The following is a list of notable month-long observances, recurrent months that are used by various governments, groups and organizations to raise awareness of an issue, commemorate a group or event, or celebrate something.
Ceremony. Ceremonial at court during Prinsjesdag. A ceremony ( UK: / ˈsɛrəməni /, US: / ˈsɛrəˌmoʊni /) is a unified ritualistic event with a purpose, usually consisting of a number of artistic components, performed on a special occasion. The word may be of Etruscan origin, via the Latin caerimonia. [ 1]
Black swan theory. The black swan theory or theory of black swan events is a metaphor that describes an event that comes as a surprise, has a major effect, and is often inappropriately rationalized after the fact with the benefit of hindsight. The term is based on a Latin expression which presumed that black swans did not exist.
In astrophysics, an event horizon is a boundary beyond which events cannot affect an observer. Wolfgang Rindler coined the term in the 1950s. [ 1] In 1784, John Michell proposed that gravity can be strong enough in the vicinity of massive compact objects that even light cannot escape. [ 2] At that time, the Newtonian theory of gravitation and ...
Events A, B, and C occur in different order depending on the motion of the observer. The white line represents a plane of simultaneity being moved from the past to the future. In physics, the relativity of simultaneity is the concept that distant simultaneity – whether two spatially separated events occur at the same time – is not absolute ...
Event (philosophy), an object in time, or an instantiation of a property in an object. Event (probability theory), a set of outcomes to which a probability is assigned. Event (relativity), a point in space at an instant in time, i.e. a location in spacetime. Event (synchronization primitive), a type of synchronization mechanism.
Special Weather Statements are issued by regional offices of the Meteorological Service of Canada for weather events that are unusual or those that cause general inconvenience or public concern and cannot adequately be described in a weather forecast. These may include widespread events such as Arctic outflows, Alberta clippers, coastal fog ...