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Barycentric Coordinate Time
Barycentric Coordinate Time (TCB) The time‐scale used in the Barycentric Celestial Reference System, the unit of which is the SI second. TCB differs from Terrestrial Time (TT) because of the movement of the Earth in the Barycentric Celestial Reference System and the Earth's immersion in the gravitational potential of the Sun and other Solar System bodies. These effects cause an overall rate change of about 0.5 s per year on which are superimposed smaller periodic variations. The time‐scale Barycentric Dynamical Time (TDB) is a convenient linear transformation of TCB that keeps in step with TT on the average.
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"Barycentric Coordinate Time." A Dictionary of Astronomy. 1997. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "Barycentric Coordinate Time." A Dictionary of Astronomy. 1997. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O80-BarycentricCoordinateTime.html "Barycentric Coordinate Time." A Dictionary of Astronomy. 1997. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-BarycentricCoordinateTime.html |
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Barycentric Dynamical Time
Barycentric Dynamical Time (TDB) A time‐scale originally intended to be used for calculating the positions of planets and other Solar System bodies using methods consistent with general relativity. Compared with Terrestrial Time, TDB exhibits small periodic variations, caused by the effects on terrestrial clocks of the changing speed and gravitational potential experienced as the Earth orbits the Sun.
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Cite this article
"Barycentric Dynamical Time." A Dictionary of Astronomy. 1997. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "Barycentric Dynamical Time." A Dictionary of Astronomy. 1997. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O80-BarycentricDynamicalTime.html "Barycentric Dynamical Time." A Dictionary of Astronomy. 1997. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-BarycentricDynamicalTime.html |
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Barycentric Celestial Reference System
Barycentric Celestial Reference System (BCRS) A non‐rotating set of spacetime coordinates centred on the barycentre of the Solar System which takes into account distortions in spacetime caused by the masses of the Sun and planets.
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Cite this article
"Barycentric Celestial Reference System." A Dictionary of Astronomy. 1997. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "Barycentric Celestial Reference System." A Dictionary of Astronomy. 1997. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O80-BarycentrcClstlRfrncSystm.html "Barycentric Celestial Reference System." A Dictionary of Astronomy. 1997. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-BarycentrcClstlRfrncSystm.html |
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barycentric coordinates
barycentric coordinates A system of coordinates with their origin at the centre of mass of the Solar System. The reference plane is usually the ecliptic. See also Heliocentric Coordinates.
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Cite this article
"barycentric coordinates." A Dictionary of Astronomy. 1997. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "barycentric coordinates." A Dictionary of Astronomy. 1997. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O80-barycentriccoordinates.html "barycentric coordinates." A Dictionary of Astronomy. 1997. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-barycentriccoordinates.html |
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