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- W2019402034 abstract "The difference between the Uniform Dynamical Time and Universal Time is referred to as <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M2><mml:mi mathvariant=normal>Δ</mml:mi><mml:mi>T</mml:mi></mml:math> (delta <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M3><mml:mrow><mml:mi>T</mml:mi></mml:mrow></mml:math>). Delta <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M4><mml:mrow><mml:mi>T</mml:mi></mml:mrow></mml:math> is used in numerous astronomical calculations, that is, eclipses,and length of day. It is additionally required to reduce quantified positions of minor planets to a uniform timescale for the purpose of orbital determination. Since Universal Time is established on the basis of the variable rotation of planet Earth, the quantity <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M5><mml:mi mathvariant=normal>Δ</mml:mi><mml:mi>T</mml:mi></mml:math> mirrors the unevenness of that rotation, and so it changes slowly, but rather irregularly, as time passes. We have worked on empirical formulae for estimating <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M6><mml:mi mathvariant=normal>Δ</mml:mi><mml:mi>T</mml:mi></mml:math> and have discovered a set of polynomials of the 4th order with nine intervals which is accurate within the range of ±0.6 seconds for the duration of years 1620–2013." @default.
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- W2019402034 date "2014-07-09" @default.
- W2019402034 modified "2023-09-24" @default.
- W2019402034 title "Delta <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M1><mml:mrow><mml:mi>T</mml:mi></mml:mrow></mml:math>: Polynomial Approximation of Time Period 1620–2013" @default.
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- W2019402034 doi "https://doi.org/10.1155/2014/480964" @default.
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