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  2. Dynamical time scale - Wikipedia

    en.wikipedia.org/wiki/Dynamical_time_scale

    In time standards, dynamical time is the independent variable of the equations of celestial mechanics. This is in contrast to time scales such as mean solar time which are based on how far the earth has turned. Since Earth's rotation is not constant, using a time scale based on it for calculating the positions of heavenly objects gives errors ...

  3. ΔT (timekeeping) - Wikipedia

    en.wikipedia.org/wiki/ΔT_(timekeeping)

    TT-UT1 2000+ ΔT vs. time from 1657 to 2022 [1] [2] In precise timekeeping, ΔT (Delta T, delta-T, deltaT, or DT) is a measure of the cumulative effect of the departure of the Earth's rotation period from the fixed-length day of International Atomic Time (86,400 seconds).

  4. Barycentric Dynamical Time - Wikipedia

    en.wikipedia.org/wiki/Barycentric_Dynamical_Time

    Barycentric Dynamical Time (TDB, from the French Temps Dynamique Barycentrique) is a relativistic coordinate time scale, intended for astronomical use as a time standard to take account of time dilation [1] when calculating orbits and astronomical ephemerides of planets, asteroids, comets and interplanetary spacecraft in the Solar System.

  5. Terrestrial Time - Wikipedia

    en.wikipedia.org/wiki/Terrestrial_Time

    A definition of a terrestrial time standard was adopted by the International Astronomical Union (IAU) in 1976 at its XVI General Assembly and later named Terrestrial Dynamical Time (TDT). It was the counterpart to Barycentric Dynamical Time (TDB), which was a time standard for Solar system ephemerides, to be based on a dynamical time scale ...

  6. Dynamic time warping - Wikipedia

    en.wikipedia.org/wiki/Dynamic_time_warping

    In time series analysis, dynamic time warping (DTW) is an algorithm for measuring similarity between two temporal sequences, which may vary in speed. For instance, similarities in walking could be detected using DTW, even if one person was walking faster than the other, or if there were accelerations and decelerations during the course of an ...

  7. Template:Time measurement and standards - Wikipedia

    en.wikipedia.org/wiki/Template:Time_measurement...

    To change this template's initial visibility, the |state= parameter may be used: {{Time measurement and standards | state = collapsed}} will show the template collapsed, i.e. hidden apart from its title bar. {{Time measurement and standards | state = expanded}} will show the template expanded, i.e. fully visible.

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