Definition
IAU resolution 3 of 2006 defines TDB as a linear transformation of TCB. TCB diverges from both TDB and TT. TCB progresses faster at a differential rate of about 0.5 second/year, while TDB and TT remain close. As of the beginning of 2011, the difference between TDB and TCB is about 16.6 seconds.
- TDB = TCB − LB×(JDTCB − T0)×86400 + TDB0
where LB = 1.550519768×10−8, TDB0 = −6.55×10−5 s, T0 = 2443144.5003725, and JDTCB is the TCB Julian date (that is, a quantity which was equal to T0 on 1977 January 1 00:00:00 TAI at the geocenter and which increases by one every 86400 seconds of TCB).
Read more about this topic: Barycentric Dynamical Time
Famous quotes containing the word definition:
“According to our social pyramid, all men who feel displaced racially, culturally, and/or because of economic hardships will turn on those whom they feel they can order and humiliate, usually women, children, and animals—just as they have been ordered and humiliated by those privileged few who are in power. However, this definition does not explain why there are privileged men who behave this way toward women.”
—Ana Castillo (b. 1953)
“... we all know the wag’s definition of a philanthropist: a man whose charity increases directly as the square of the distance.”
—George Eliot [Mary Ann (or Marian)
“The physicians say, they are not materialists; but they are:MSpirit is matter reduced to an extreme thinness: O so thin!—But the definition of spiritual should be, that which is its own evidence. What notions do they attach to love! what to religion! One would not willingly pronounce these words in their hearing, and give them the occasion to profane them.”
—Ralph Waldo Emerson (1803–1882)