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We use this estimate to derive a time series of "clock error", defined as the difference in timing of two clocks, one based on a theoretically invariant time scale (terrestrial time) and one fixed to Earth rotation (universal time), and compare this time series to millennial scale variability in clock error inferred from ancient eclipse records.
Calculations are made some years ahead in Terrestrial Time (TT), which is defined by the orbital motion of Earth and the other planets.
For astronomical purposes, it is preferable to utilize an invariant time frame such as Terrestrial Time (the modern successor to Ephemeris Time)—defined by the motion of the Sun, Moon, and planets.
"We wanted to represent terrestrial time using a globe that would show different times and tell you, at a glance, whether it was morning or night anywhere around the world".
Other scientific time standards include Terrestrial Time and Barycentric Dynamical Time.
For instance, the Astronomical Almanac lists the heliocentric position of Mars at 0h Terrestrial Time, 4 Jan 2010 as: longitude 118° 09' 15".8, latitude +1° 43' 16".7, true heliocentric distance 1.6302454 AU, mean equinox and ecliptic of date.
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(Hubbard's early stories were for the Astounding Science-Fiction magazine. In Scientology, he kept many elements of extra-terrestrial time travel and reincarnation: he reckoned that when he died, he would become a heavenly body, twinkling in the Kubrickian depths).
Terrestrial Dynamical Time (TDT) is an auxiliary scale defined by the equation TDT = TAI + 32.184 s.
No less an authority than the prestigious Screen Break column agreed that domestic audiences might raise a Eurosceptic eyebrow at the prospect of hours of terrestrial prime time given over to foreigners playing football.
In this particular area, the environment probably became more terrestrial as time passed, with rocks representing the dunes along the margin of the sea occurring above rocks formed in the shallow water just at its edge (in most situations rocks occurring higher in a sequence formed after those lower in the sequence).
Leverkusen's Roger Schmidt, a man who wouldn't look out of place as a police detective in a terrestrial tea-time show set in Paderborn and the Wolfsburg manager Dieter Hecking, who served as an actual Polizeimeister for three years prior to his playing career, might still, yes, cop similar praise with a bit more consistency after the winter break.
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