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A first application of this concept of dynamical time was the definition of the ephemeris time scale (ET). [ 1 ] [ 2 ] In the late 19th century it was suspected, and in the early 20th century it was established, that the rotation of the Earth ( i.e. the length of the day ) was both irregular on short time scales, and was slowing down on longer ...
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.
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 ...
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.
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).
Ephemeris time (ET), adopted as standard in 1952, was originally designed as an approach to a uniform time scale, to be freed from the effects of irregularity in the rotation of the Earth, "for the convenience of astronomers and other scientists", for example for use in ephemerides of the Sun (as observed from the Earth), the Moon, and the planets.
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