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	Barycentric Dynamical Time - Wikipedia, the free encyclopedia
		Barycentric Dynamical Time (TDB) was defined by the International Astronomical Union (IAU) in 1976 to be used as the relativistic replacement for the non-relativistic Ephemeris Time which had been used in the ephemerides starting in 1960.
		Terrestrial Dynamical Time (TDT) and TDB were defined in a series of resolutions at the same meeting of the International Astronomical Union.
		Despite IAU recommendations that TCB be used for all further calculations of solar system ephemerides, as of 2002 TDB and Ephemeris Time continue to be used, the latter by the producer of the important DE200 ephemeris and its successors at the Jet Propulsion Laboratory.
	en.wikipedia.org /wiki/Barycentric_Dynamical_Time (665 words)

	CalendarHome.com - Time scale - Calendar Encyclopedia
		Terrestrial Time is time at the surface of the Earth.
		Barycentric Coordinate Time is a coordinate time scale at the center of mass of the solar system, which is called the barycenter.
		Geocentric Coordinate Time (TCG) is a coordinate time having its spatial origin at the center of mass of the Earth.
	encyclopedia.calendarhome.com /Time_standard.htm (1221 words)

	Barycentric Coordinate Time. Who is Barycentric Coordinate Time? What is Barycentric Coordinate Time? Where is ...
		Barycentric Coordinate Time (TCB) was defined in 1991 by the International Astronomical Union as one of the replacements for the ill-defined Barycentric Dynamical Time (TDB).
		TCB is the timescale which would be produced by a clock ticking SI seconds at rest in a coordinate frame co-moving with the barycenter of the solar system.
		The relationship between TCB and Terrestrial Time (TT) is defined with a fully general relativistic metric.
	www.knowledgerush.com /kr/encyclopedia/Barycentric_Coordinate_Time (196 words)

	time scale (Site not responding. Last check: 2007-10-15)
		Ephemeris time, dynamical time and coordinate time are all intended to provide a uniform time for planetary motion calculations.
		Barycentric Dynamical Time (TDB) is similar to TDT but includes relativistic corrections that move the origin to the barycenter.
		Barycentric Coordinate Time (TCB) is a coordinate time having its spatial origin at the solar system barycenter.
	www.yourencyclopedia.net /time_scale.html (1246 words)

	The Time
		Barycentric Dynamical Time, or TDB, is the same as Barycentric Coordinate Time only differing by a constant factor which is chosen so as to make TDB differ from Terrestrial Time by only periodic and Poisson terms.
		Geocentric Coordinate Time, or TCG, is the same as Barycentric Coordinate Time, except that it uses the Earth's center, rather than the barycenter of the solar system (and an “asymptotic” observer is one free from the gravitational field of the Earth rather than that of all the solar system).
		Coordinated Universal Time, or UTC is the official standard of time throughout the world, being the basis for legal time.
	www.madore.org /~david/misc/time.html (3957 words)

	Time scale (Site not responding. Last check: 2007-10-15)
		Solar time is based on the solar day, which is the periodof time between one solar noon and the next.
		International Atomic Time (TAI) is the primary international time standard from which other time standards, including UTC, are calculated.TAI is kept by the BIPM (International Bureau of Weights and Measures), and is based on the combined input of many atomic clocks around the world, each corrected for environmental and relativisticeffects.
		Barycentric Coordinate Time is a coordinate time scale at the center of mass of the solarsystem, which is called the barycenter.
	www.therfcc.org /time-scale-20698.html (1126 words)

	Systems of Time (Site not responding. Last check: 2007-10-15)
		Atomic Time, with the unit of duration the Systeme International (SI) second defined as the duration of 9,192,631,770 cycles of radiation corresponding to the transition between two hyperfine levels of the ground state of cesium 133.
		Terrestrial Time (TT), (or Terrestrial Dynamical Time, TDT), with unit of duration 86400 SI seconds on the geoid, is the independent argument of apparent geocentric ephemerides.
		Sidereal Time, with unit of duration the period of the Earth's rotation with respect to a point nearly fixed with respect to the stars, is the hour angle of the vernal equinox.
	tycho.usno.navy.mil /systime.html (560 words)

	Time scale
		Geocentric Coordinate Time is a proper time scale at the Earth's center.
		Barycentric Coordinate Time is a proper time scale at the center of gravity of the solar system, which is called the barycenter.
		Barycentric Dynamical Time[?] (TDB) is similar to TT but includes relativistic corrections that move the origin to the barycenter.
	www.fastload.org /ti/Time_scale.html (1075 words)

	Barycentric Dynamical Time. Who is Barycentric Dynamical Time? What is Barycentric Dynamical Time? Where is Barycentric ...
		Beginning with the ephemeris for 1984, TDB has been the independent variable of time used for calculating the motions of bodies in the solar system.
		On the average the rate of TDB matches the rate of atomic clocks ticking SI seconds on the surface of the earth.
		Terrestrial Dynamical Time (TDT) was defined at the same time as TDB.
	www.knowledgerush.com /kr/encyclopedia/Barycentric_Dynamical_Time (333 words)

	Time Scales
		Although the term GMT was not explicitly used, the standard time for legal purposes in the United States specified by 15USC261 (the Calder Act) was defined to be based on the mean astronomical time of meridians spaced at 15-degree intervals west of Greenwich; i.e., GMT.
		Although the term GMT was not explicitly used, the standard time for legal purposes in the United States specified by 15USC261 was clarified and reaffirmed to be based on the mean solar time of meridians spaced at 15-degree intervals west of Greenwich; i.e., GMT.
		TT is a coordinate time scale for a reference frame which moves with the geocenter, but TT ticks at a rate equal to that of clocks on the rotating geoid.
	www.ucolick.org /~sla/leapsecs/timescales.html (12046 words)

	Coordinate
		Barycentric Coordinate Time Barycentric Coordinate Time (TCB) was defined in Ephemeris Time (ET).
		Coordinate covalent bond A coordinate covalent bond is a special type of atoms only.
		Geocentric Coordinate Time Geocentric Coordinate Time (TCG) was defined in nutation, the moon, and artificial satellites...
	www.brainyencyclopedia.com /topics/coordinate.html (251 words)

	Time scale - Wikipedia, the free encyclopedia
		A time scale specifies divisions (scale) of time.
		A time standard is a specification of either the rate at which time passes, or points in time, or both.
		Music may, however, exist "outside" of time when structured through "principles whose defnitions does not imply a temporal order", including scales and many other precompositional techniques, musical instruments, and aleatoric music.
	www.wikipedia.org /wiki/Time_scales (284 words)

	The Time
		Barycentric Coordinate Time only differing by a constant factor which is chosen so as to make TDB differ from Terrestrial Time by only periodic and Poisson terms.
		Barycentric Coordinate Time, except that it uses the Earth's center, rather than the barycenter of the solar system (and an “asymptotic” observer is one free from the gravitational field of the Earth rather than that of all the solar system).
		Coordinated Universal Time, TAI is a linear standard: to the best precision achieved, it ticks by one second every SI second.
	www.madore.org /~david/misc/time.daml (4054 words)

	SLA_RCC - Barycentric Coordinate Time (Site not responding. Last check: 2007-10-15)
		The proper time is Terrestrial Time, TT; the coordinate time is an implementation of Barycentric Dynamical Time, TDB.
		TDB is coordinate time in the solar system barycentre frame of reference, in units chosen to eliminate the scale difference with respect to terrestrial time.
		are the barycentric positions of the observer and the Earth respectively, and c is the speed of light.
	star-www.rl.ac.uk /star/docs/sun67.htx/node165.html (442 words)

	SLA_RCC - Barycentric Coordinate Time
		The proper time is TT; the coordinate time is an implementation of TDB.
		TDB may be considered to be the coordinate time in the solar system barycentre frame of reference, and TT is the proper time given by clocks at mean sea level on the Earth.
		The argument TDB is, strictly, the barycentric coordinate time; however, the terrestrial proper time (TT) can in practice be used.
	www.hartrao.ac.za /nccsdoc/slalib/sun67.htx/node163.html (332 words)

	Dainis Dravins & Lennart Lindegren (Lund Observatory)
		The astrometric radial velocity refers to the variation of the coordinates of the source, and therefore depends on the chosen coordinate system and time scale.
		For example, "radial velocity" may be defined as the rate of change in distance with respect to "time".
		Note: The Barycentric Celestial Reference System (including the Barycentric Coordinate Time) is defined in Resolutions B1.3 and B1.5 adopted at the IAU XXIV:th General Assembly in 2000.
	www.astro.lu.se /~dainis/HTML/ASTRVEL.html (613 words)

	Chandra: A Time Tutorial (Site not responding. Last check: 2007-10-15)
		TCB (Barycentric Coordinate Time): The coordinate time equivalent of TB.
		The vectors xe and ve denote the barycentric position and velocity of the earth's center of mass, and x is the barycentric position of the observer.
		The origins of coordinate times have been arbitrarily set so that these times all coincide with TT at the geocenter of 1977.0 (TAI).
	hea-www.harvard.edu /~arots/time/time_tutorial.html (730 words)

	Time equations and notes
		Coordinated Universal Time (UTC)weighted average of the various atomic time scales
		Ephemeris Time - is determined by the orbital motion of the Earth about the Sun (not affected by earth's rotational wobble)
		Universal Time (UT0) - is equivalent to mean solar time at the Greenwich Meridian (Greenwich Mean Time, or GMT).
	www.parrett.net /~wolf/Time_equations_and_notes.htm (672 words)

	Evaluating spatial- and temporal-oriented multi-dimensional visualization techniques. Yu, Chong Ho & Shawn Stockford
		In the graph, there are four dimensions--three variables are depicted in the triangular coordinates on the "floor" of the data space, while the Y variable is represented as a vertical axis as in the Cartesian (rectangular) coordinate system.
		As in some other higher-dimensional graphs, in the density plot using Barycentric coordinates, the presence or absence of interaction effects can be judged by seeing whether the mesh surface is flat or curved.
		The "time" dimension can be designated as a variable where the values of the variable are used to illustrate change.
	pareonline.net /getvn.asp?v=8&n=17 (5081 words)

	Luna
		It was launched on a figure-eight trajectory which brought it over the Moon (closest approach to the Moon was 6200 km) and around the far side, which was sunlit at the time.
		The photographs were scanned and 17 were radio transmitted to ground stations in facsimile form on October 18, 1959, as the spacecraft, in a barycentric orbit, returned near the Earth.
		Despite the cause of the failure not being identified, approval is given at 14:30 for the launch of the Ye-8 to proceed.
	www.astronautix.com /project/luna.htm (4361 words)

	Astron. Astrophys. 336, 381-384 (1998) (Site not responding. Last check: 2007-10-15)
		Time scales in the JPL and CfA ephemerides
		Finally, they have defined a time system which is physically possible, according to the accepted standard theory of gravitation: TCB ("Barycentric Coordinate Time").
		, the time scale that has been used by JPL and by MIT (the group later went to CfA) in their ephemeris creation processes since the 1960's.
	aa.springer.de /papers/8336001/2300381/small.htm (140 words)

	2 Proper time in terms of coordinate time (Site not responding. Last check: 2007-10-15)
		The Solar-system barycentric coordinates, centred on the barycenter of the Solar system, are denoted
		Note that at this level of uncertainty it is crucial to take into account in the relation (3) the non-sphericity (oblaticity) of the Earth Newtonian potential.
		For example, for a clock B fixed on the Earth surface, the relativistic correction term appearing in the coordinate/proper time relation (3) is given with the required precision by
	aanda.u-strasbg.fr:2002 /articles/aa/full/2001/16/aa10424/node2.html (520 words)

	3D Computer Graphics FAQ - Games++
		For example, to do a parallel projection of a scene onto a viewing rectangle, you can just discard the Z coordinate (divide by depth), and "clip" the objects to the viewing rectangle (discard portions that lie outside the region).
		The obvious but wrong method is to loop over the pixels in the source image, transform each coordinate, and copy the pixel to the destination.
		I have been an active participant in several of these for some time now, and find the focus and expertise which can be brought to bear on an isolated topic to be nothing short of amazing.
	www.gamespp.com /graphicsprogramming/3DComputerGraphicsFaq.html (5901 words)

	Time scale - InfoSearchPoint.com (Site not responding. Last check: 2007-10-15)
		de:Zeitskala A time scale specifies divisions of time.
		Neglecting the periodic terms, in the sense of an average over a long period of time the two are related by: TCB - TT = L
		According to IAU the best estimate of the scale difference L
	www.infosearchpoint.com /display/Time_scale (1167 words)

	Summary and Resolutions (Site not responding. Last check: 2007-10-15)
		is the barycentric velocity of the Earth and where the index ext refers to summation over all bodies except the Earth.
		are the polar angles corresponding to the spatial coordinates
		Recommends that, whenever radial velocities are considered to a high accuracy, the spectroscopic result from a measurement of shifts in wavelength or frequency is given as the [barycentric] "radial-velocity measure" cz, after correcting for gravitational effects caused by solar-system objects, and effects by the observer's displacement and motion relative to the solar-system barycenter.
	riemann.usno.navy.mil /colloq180/Resolutions_Eng/ResolutionsMar30.htm (3221 words)

	Barycentric calculus in TutorGig Search (Site not responding. Last check: 2007-10-15)
		Barycentric coordinates, Barycentric subdivision, Calculus, Barycentric Coordinate Time, Barycentric Dynamical Time (More...
		DVD See all 22 results in Barycentric calculus...
		Electronics See all 4 results in Barycentric calculus...
	www.tutorgig.com /w/Barycentric+calculus (235 words)

Time scale : Time scales (Site not responding. Last check: 2007-10-15)

Time scale : Time scales

Time scale : Time scales
article at Free Euro Online Encyclopedia

It uses material from the wikipedia article Time scale : Time scales.

www.eurofreehost.com /ti/Time_scales_3.html (461 words)

	(16Oct95) comp.graphics.misc Frequently Asked Questions (FAQ)
		Send mail to ftpmail@decwrl.dec.com saying "help" and it will tell you how to use it.
		Note that this service has at times been turned off due to abuse.
		This section provides information on how to obtain frequently sought items.
	www.faqs.org /faqs/graphics/faq (6720 words)

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Topic: Barycentric Coordinate Time

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