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  2. Chronology - Wikipedia

    en.wikipedia.org/wiki/Chronology

    The fundamental problem of chronology is to synchronize events. By synchronizing an event it becomes possible to relate it to the current time and to compare the event to other events. Among historians, a typical need is to synchronize the reigns of kings and leaders in order to relate the history of one country or region to that of another.

  3. List of idioms of improbability - Wikipedia

    en.wikipedia.org/wiki/List_of_idioms_of...

    "When Hell freezes over" [2] and "on a cold day in Hell" [3] are based on the understanding that Hell is eternally an extremely hot place. The "Twelfth of Never" will never come to pass. [4] A song of the same name was written by Johnny Mathis. "On Tibb's Eve" refers to the saint's day of a saint who never existed. [5] "When two Sundays come ...

  4. Event (relativity) - Wikipedia

    en.wikipedia.org/wiki/Event_(relativity)

    One of the goals of relativity is to specify the possibility of one event influencing another. This is done by means of the metric tensor, which allows for determining the causal structure of spacetime. The difference (or interval) between two events can be classified into spacelike, lightlike and timelike separations. Only if two events are ...

  5. Event (philosophy) - Wikipedia

    en.wikipedia.org/wiki/Event_(philosophy)

    In his view, there is no "one," and everything that is is a "multiple." "One" happens when the situation "counts," or accounts for, acknowledges, or defines something: it "counts it as one." For the event to be counted as one by the situation, or counted in the one of the situation, an intervention needs to decide its belonging to the situation.

  6. Time - Wikipedia

    en.wikipedia.org/wiki/Time

    Time is the continuous progression of our changing existence that occurs in an apparently irreversible succession from the past, through the present, and into the future. [1] [2] [3] It is a component quantity of various measurements used to sequence events, to compare the duration of events (or the intervals between them), and to quantify rates of change of quantities in material reality or ...

  7. Spacetime - Wikipedia

    en.wikipedia.org/wiki/Spacetime

    Two events can be defined by the condition "two clocks are simultaneously at one place", i.e., when W′ passes each W 1 and W 2. For both events the two readings of the collocated clocks are recorded. The difference of the two readings of W 1 and W 2 is the temporal distance of the two events in S, and their spatial distance is d. The ...

  8. Twin paradox - Wikipedia

    en.wikipedia.org/wiki/Twin_paradox

    This is a different voyage than the one shown above, as both schemes take the same assumed total point-of-view time: T=12 (stay-at-home), resp τ=12 (ship), so the results of the calculated other-one's times must be different: τ=9.33 (ship), resp T=17.3 (stay at home). In the standard proper time formula

  9. Day - Wikipedia

    en.wikipedia.org/wiki/Day

    The most common convention starts the civil day at midnight: this is near the time of the lower culmination of the Sun on the central meridian of the time zone. Such a day may be called a calendar day. A day is commonly divided into 24 hours, with each hour being made up of 60 minutes, and each minute composed of 60 seconds.