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  2. Multiple time dimensions - Wikipedia

    en.wikipedia.org/wiki/Multiple_time_dimensions

    Multiple independent timeframes, in which time passes at different rates, have long been a feature of stories. [15] Fantasy writers such as J. R. R. Tolkien and C. S. Lewis have made use of these and other multiple time dimensions, such as those proposed by Dunne, in some of their most well-known stories. [15]

  3. Safety data sheet - Wikipedia

    en.wikipedia.org/wiki/Safety_data_sheet

    An example SDS, including guidance for handling a hazardous substance and information on its composition and properties. A safety data sheet (SDS), [1] material safety data sheet (MSDS), or product safety data sheet (PSDS) is a document that lists information relating to occupational safety and health for the use of various substances and products.

  4. Relativity of simultaneity - Wikipedia

    en.wikipedia.org/wiki/Relativity_of_simultaneity

    If one reference frame assigns precisely the same time to two events that are at different points in space, a reference frame that is moving relative to the first will generally assign different times to the two events (the only exception being when motion is exactly perpendicular to the line connecting the locations of both events).

  5. Why meteorological and astronomical fall start on 2 different dates Equinox comes from the Latin words aequi , which means equal, and nox , which means night. On the day of the equinox, the sun's ...

  6. Before Present - Wikipedia

    en.wikipedia.org/wiki/Before_Present

    The abbreviation "BP" has been interpreted retrospectively as "Before Physics", [1] [2] which refers to the time before nuclear weapons testing artificially altered the proportion of the carbon isotopes in the atmosphere, which scientists must account for when using radiocarbon dating for dates of origin that may fall after this year.

  7. Coincidence method - Wikipedia

    en.wikipedia.org/wiki/Coincidence_method

    In particle physics, the coincidence method (or coincidence technique) is an experimental design through which particle detectors register two or more simultaneous measurements of a particular event through different interaction channels. Detection can be made by sensing the primary particle and/or through the detection of secondary reaction ...

  8. Fiscal Quarters (Q1, Q2, Q3, Q4) Explained and What ... - AOL

    www.aol.com/fiscal-quarters-q1-q2-q3-192741265.html

    Q4 is also a time when all companies can take a look ahead to the next year’s Q1, building on the lessons learned in the current year to set up reasonable targets for the upcoming year. How the ...

  9. Problem of time - Wikipedia

    en.wikipedia.org/wiki/Problem_of_time

    The field equations of general relativity are not parameterized by time but formulated in terms of spacetime. Many of the issues related to the problem of time exist within general relativity. At the cosmic scale, general relativity shows a closed universe with no external time. These two very different roles of time are incompatible. [4]