What does ephemeris time mean?
Definitions for ephemeris time
ephemeris time
This dictionary definitions page includes all the possible meanings, example usage and translations of the word ephemeris time.
Princeton's WordNet
terrestrial time, TT, terrestrial dynamical time, TDT, ephemeris timenoun
(astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth's motions
Wiktionary
ephemeris timenoun
A former standard astronomical time scale intended to overcome the drawbacks of irregularly fluctuating mean solar time, superseded in the 1970s.
ephemeris timenoun
A modern relativistic-coordinate time scale.
ChatGPT
ephemeris time
Ephemeris Time (ET) is a former standard astronomical time system which was used to calculate the position and motions of celestial bodies such as planets, asteroids, and comets. It was defined as the measure of time that brings the observed positions of celestial bodies into accord with the Newtonian dynamical theory of motion. ET was replaced by Terrestrial Dynamical Time (TDT) and Barycentric Dynamical Time (TDT) in the 1980s.
Wikidata
Ephemeris time
The term ephemeris time can in principle refer to time in connection with any astronomical ephemeris. In practice it has been used more specifically to refer to: ⁕a former standard astronomical time scale adopted in 1952 by the IAU, and superseded in the 1970s. This time scale was proposed in 1948, to overcome the drawbacks of irregularly fluctuating mean solar time. The intent was to define a uniform time based on Newtonian theory. Ephemeris time was a first application of the concept of a dynamical time scale, in which the time and time scale are defined implicitly, inferred from the observed position of an astronomical object via the dynamical theory of its motion. ⁕a modern relativistic coordinate time scale, implemented by the JPL ephemeris time argument Teph, in a series of numerically integrated Development Ephemerides. Among them is the DE405 ephemeris in widespread current use. The time scale represented by Teph is closely related to, but distinct from, the TCB time scale currently adopted as a standard by the IAU.
Numerology
Chaldean Numerology
The numerical value of ephemeris time in Chaldean Numerology is: 7
Pythagorean Numerology
The numerical value of ephemeris time in Pythagorean Numerology is: 1
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"ephemeris time." Definitions.net. STANDS4 LLC, 2024. Web. 28 Apr. 2024. <https://www.definitions.net/definition/ephemeris+time>.
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