Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: UT1 prediction based on long-time series analysis   A new method is developed for prediction of UT1. The method is based on
construction of a general harmonic model of the Earth rotation using all the
data available for the last 80-100 years, and modified autoregression
technique. A rigorous comparison of UT1 predictions computed at SNIIM with the
prediction computed by IERS (USNO) in 2008-2009 has shown that proposed method
pro-vides substantially better accuracy.

37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an