Terrestrial Time is a theoretical uniform time scale, defined to provide continuity with the former Ephemeris Time ( ET ).

ET was an independent time-variable, proposed ( and its adoption agreed ) in the period 1948 – 52 with the intent of forming a gravitationally uniform time scale as far as was feasible at that time, and depending for its definition on Simon Newcomb's Tables of the Sun ( 1895 ), interpreted in a new way to accommodate certain observed discrepancies.

Newcomb's tables formed the basis of all astronomical ephemerides of the Sun from 1900 through 1983: they were originally expressed ( and published ) in terms of Greenwich Mean Time and the mean solar day, but later, in respect of the period 1960 – 1983, they were treated as expressed in terms of ET, in accordance with the adopted ET proposal of 1948 – 52.

The term ephemeris time ( often abbreviated ET ) can in principle refer to time in connection with any astronomical ephemeris.

Close equality between the ET second with the later SI second ( as defined with reference to the cesium atomic clock ) has been verified to within 1 part in 10 < sup > 10 </ sup >.

These measurements can be considered as secondary realizations ( in a metrological sense ) of the primary definition of ET in terms of the solar motion, after a calibration of the mean motion of the Moon with respect to the mean motion of the Sun.

Such secondary realizations were used and described as ' ET ', with an awareness that the time scales based on the atomic clocks were not identical to that defined by the primary ephemeris time standard, but rather, an improvement over it on account of their closer approximation to uniformity.

The atomic clocks gave rise to the atomic time scale, and to what was first called Terrestrial Dynamical Time and is now Terrestrial Time, defined to provide continuity with ET.

The availability of atomic clocks, together with the increasing accuracy of astronomical observations ( which meant that relativistic corrections were at least in the foreseeable future no longer going to be small enough to be neglected ), led to the eventual replacement of the ephemeris time standard by more refined time scales including terrestrial time and barycentric dynamical time, to which ET can be seen as an approximation.

In addition to these motor problems, a variety of non-motor features have recently been linked with ET.

Recent studies have demonstrated that late-onset ET ( onset > age 65 ) may be associated with an increased risk of developing dementia.

ET is one of the most common neurological diseases, with a prevalence of approximately 4 % in persons age 40 and older and considerably higher among persons in their 60s, 70s, 80s, and 90s.

In disabling cases, ET can interfere with a person's ability to perform tasks of daily living, including feeding, dressing, and activities of personal hygiene.

People with ET can sometimes have problems with word finding and can't articulate themselves effectively even with preparation.

A person with ET may become shy, withdrawn, pessimistic, anxious and also have difficulties concentrating.

It is common for those with ET to be embarrassed by the condition even though it is out of their control.

Recent postmortem studies have demonstrated the presence of degenerative changes in the ET brain, with these changes including Purkinje cell axonal swellings and Purkinje cell loss in the majority of cases and brainstem Lewy bodies in the remainder.

ET does sometimes occur in combination with other neurological disorders such as dystonia.

In addition, there may be a link between ET and Parkinson's disease, with one study showing ET patients having an approximately 4 times greater likelihood of developing Parkinson's disease.

Minor cases of ET can be treated with physical therapy and development of the muscles in the sections of the body that are severe in their shaking.

ET, which allowed the game to be joined in progress late in the first period.

The first game of the Saturday night doubleheader typically originates in Eastern Canada, beginning at 7 p. m. ET / 4 p. m. PT.

In previous years, Raycom Sports syndicated regional coverage for an SEC game of the week at 12: 30 ET, but the new contract replaced it with a new ESPN-produced syndication package, the SEC Networkwhose football games kickoff at 12: 21 ET.

ET game ( Oakland Raiders at Denver Broncos ) was shown on ESPN2 as the game that began at 7 p. m.

ET, with a pre-game show titled Monday Night Blast and hosted by Chris Berman from the ESPN Zone restaurant in Baltimore preceding the start of the game at 8: 20 p. m.

Wolfenstein: Enemy Territory ( also referred to as simply Enemy Territory, ET, or W: ET ) is a free and open source multiplayer first-person shooter video game set during World War II.

The event was also highlighted by a slew of major announcements, including id Software's new intellectual property RAGE, a sneak peek at the " id Tech 5 " engine, a 10-2-2007 release date for ET: QW, updates on the new Return to Castle Wolfenstein game title and major motion picture, the revelation that old id Software titles were to be made available via Steam, the upcoming debuts of Quake Arena Arcade, Quake Zero ( now officially named Quake Live ), and Quake Arena DS, also — in an unprecedented move — the announcement of the dates and venue for the next QuakeCon before the current year's event was even finished.

ET on Saturday afternoon – the only day game of the series, and the last World Series game to date to be played in the daytime ( although as the game was played in the Metrodome, the game took place under artificial illumination all the same ).

As a result, West Coast teams generally have to play on the road at 1 p. m. ET / 10 a. m. PT when many of their fans are unable to watch the game because they are at work or school.

Conversely, when games on the West Coast are played at 10 p. m. ET / 7 p. m. PT, many fans on the East Coast are unable to watch a game in its entirety, due to games ending around 1 a. m. ET / 10 p. m. PT, while most West Coast fans are able to watch the entire game.

However, MLB Commissioner Bud Selig had moved the starting time of Game 5 to primetime, due to the rematch, and Fox had a triple-header, first the Seattle Seahawks – New England Patriots game at Gillette Stadium at 1: 00 pm ET, then Game 4 of the NLCS between the St. Louis Cardinals and Houston Astros at Minute Maid Park at 4: 30 pm ET.

For example, it might begin as early as 9: 30pm ET ( i. e. immediately following a 7: 00pm ET NHL game ), or as late as after midnight ET if delayed due to live events.

To reach the largest television audience, the speech, once given during the day, is now typically given in the evening, after 9 pm ET.

Encores of each night's programs typically air between 11 p. m. and 3 a. m. ET / PT each night.

SportsCenter normally airs live on weekdays from 9 AM ET to 3 ET, as well as at 6 ET ( typically 60 or 90 minutes ), 11 ET and 1 AM ET ( typically 60 minutes each ).

TSN has gradually increased the length and, in some cases, repetition of SportsCentre broadcasts such that the channel now typically carries the program for up to 13. 5 hours out of the day ( including the " morning loop " repeats of the previous night's 1: 00am ET edition ), while TSN2 typically airs repeats of either SportsCentre or SportsCentre Morning Rush for a total of nine hours a day.

ET typically affects the hands and arms but can also affect the head, voice, chin, trunk and legs.

Wednesdays also included an afternoon game, called ESPN DayGame which aired typically at 12: 30pm or 1pm ET on ESPN, making Wednesdays ESPN's primary day of baseball, as games aired both in the afternoon and in primetime.

The ET also maintains an open airway at all times, even during CPR compressions ; a BVM can typically only be operated during set pauses in compressions.

ET ( in the slot typically occupied by Special Report with Bret Baier on the weekdays ).

Prior to the closing of the Vandenberg facility, orbiters were transported from the OPF to the VAB on their undercarriages, only to be raised when the orbiter was being lifted for attachment to the SRB / ET stack.

Since October 2010, programming on both night's schedules has been somewhat fluid as while all series have a permanent place on the Friday and Sunday primetime schedules, episode premieres of all Disney Channel original series are subject to being rotated on and off the schedule depending on the schedule for that given week as they usually air as part of a 90-minute block from 8 – 9: 30 p. m. ET / PT on Friday evenings and 7: 30 – 9 p. m. ET / PT on Sunday evenings.

In July, the 24-hr average temperature is, which prevents the climate from being polar ( Köppen: ET ).

ET until being reduced to one hour to accommodate the premiere of Captain Kangaroo in 1955 ).

ET on May 5, 1997 ), and two sleeker versions were introduced in 1999 ( with his mouth being smoother ) and 2001 ( with his pupils in his eyes ( still oval ) now spinning usually ).

ABC Family currently offers a slate of mostly reruns of contemporary comedies, such as Full House, 8 Simple Rules, Grounded For Life, Still Standing, Friends, What I Like About You, America's Funniest Home Videos, That ' 70s Show and My Wife and Kids, with the only off-network drama series on the schedule being Friday Night Lights ( since moved to ESPN Classic due to low ratings and better audience compatibility ) and Gilmore Girls ( which resumed airing weekdays at 5pm ET in February 2012 as reruns of Secret Life performed under expectations ).

MTV airs the show several times during daytime hours in addition to its regular timeslots around 10: 00 PM ( ET ), and the PTC claimed that the adolescents whom MTV is targeting are being exposed to " excessive sexual and profane content through inaccurately rated programs.

After a ten-year absence in the U. S., reruns of the show had started airing on Disney Junior since March 23, 2012, and are now being shown every day at 5: 00AM ET and weekends at 6: 30AM ET.

On October 10, 2007, CNBC moved Kudlow & Company from the 5pm ET to the 7pm ET timeslot, being replaced by Fast Money.

ET before being discontinued in October 2009.

After being one of the better players for NSW in the 1988 Origin series which Queensland won 3-0, ET was selected for his first test match for Australia.

ET later stated that despite being regarded as one of the fastest players in the NSWRL, if not for having less ground to cover he would not have got near Offiah for pace.

1994 saw ET back at his best, seeing him score a total of 18 tries from just 18 games and leading the Sharks by example after also being awarded the captaincy of the Sharks.

He is the former anchor of State of the Union with John King, as well as John King, USA, which appeared weeknights at 7pm / ET on CNN before being cancelled.

During launch the ET accelerated to about 98 % of orbital speed before being dropped and deliberately spun in order to increase its drag.