Error Minimization of Polynomial Approximation of Delta 𝑇

Journal of astrophysics and astronomy

Sadiq Muhammad¹  Islam Sana1¹  Qureshi Muhammad Shahid² 

[1] Department of Applied Physics, University of Karachi, Pakistan.$$;Institute of Space and Planetary Astrophysics, University of Karachi, Pakistan.$$

关键词: Delta 𝑇;    polynomial approximation;    Dynamical time;    Universal time.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

The difference between Universal time (UT) and Dynamical time (TD), known as Delta 𝑇(𝛥 𝑇) is tabulated for the first day of each year in the Astronomical Almanac. During the last four centuries it is found that there are large differences between its values for two consecutive years. Polynomial approximations have been developed to obtain the values of 𝛥 𝑇 for any time of a year for the period AD 1620 to AD 2000 (Meeu 2000) as no dynamical theories describe the variations in 𝛥 𝑇. In this work, a new set of polynomials for 𝛥 𝑇 is obtained for the period AD 1620 to AD 2007 that is found to produce better results compared to previous attempts.

【 授权许可】

Unknown