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  2. Age of the universe - Wikipedia

    en.wikipedia.org/wiki/Age_of_the_universe

    In physical cosmology, the age of the universe is the time elapsed since the Big Bang: 13.8 billion years. [1] Astronomers have two different approaches to determine the age of the universe . One is based on a particle physics model of the early universe called Lambda-CDM , matched to measurements of the distant, and thus old features, like the ...

  3. Time dilation - Wikipedia

    en.wikipedia.org/wiki/Time_dilation

    Time dilation is the difference in elapsed time as measured by two clocks, either because of a relative velocity between them (special relativity), or a difference in gravitational potential between their locations (general relativity). When unspecified, "time dilation" usually refers to the effect due to velocity.

  4. Twin paradox - Wikipedia

    en.wikipedia.org/wiki/Twin_paradox

    Δτ represents the time of the non-inertial (travelling) observer K' as a function of the elapsed time Δt of the inertial (stay-at-home) observer K for whom observer K' has velocity v(t) at time t. To calculate the elapsed time Δt of the inertial observer K as a function of the elapsed time Δτ of the non-inertial observer K', where only ...

  5. Post-mortem interval - Wikipedia

    en.wikipedia.org/wiki/Post-mortem_interval

    Post-mortem phenomena to estimate the time of death. The post-mortem interval ( PMI ) is the time that has elapsed since an individual's death . [ 1 ] When the time of death is not known, the interval may be estimated, and so an approximate time of death established.

  6. Time perception - Wikipedia

    en.wikipedia.org/wiki/Time_perception

    The Kappa effect or perceptual time dilation [55] is a form of temporal illusion verifiable by experiment. [56] The temporal duration between a sequence of consecutive stimuli is thought to be relatively longer or shorter than its actual elapsed time, due to the spatial/auditory/tactile separation between each consecutive stimuli.

  7. Orbital period - Wikipedia

    en.wikipedia.org/wiki/Orbital_period

    It applies to the elapsed time where planets return to the same kind of phenomenon or location, such as when any planet returns between its consecutive observed conjunctions with or oppositions to the Sun. For example, Jupiter has a synodic period of 398.8 days from Earth; thus, Jupiter's opposition occurs once roughly every 13 months.

  8. Orbit phasing - Wikipedia

    en.wikipedia.org/wiki/Orbit_phasing

    To find some of the phasing orbital parameters, first one must find the required period time of the phasing orbit using the following equation. = where T 1 is defined as period of original orbit; T 2 is defined as period of phasing orbit; t is defined as time elapsed to cover phase angle in original orbit

  9. Settling time - Wikipedia

    en.wikipedia.org/wiki/Settling_time

    In control theory the settling time of a dynamical system such as an amplifier or other output device is the time elapsed from the ... time as "the time required for ...

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