Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Moon's perigee mass as a missing component of the Earth's
  precession-nutation theory   In this work, the nutation momentum acting upon the Earth from the Moon's
perigee mass that has not been taken into account in the Earth's
precession-nutation theory was revealed. This missing momentum exhibits itself
in the so-called "local latitude variation" with the Chandler's period. The
results of our work raise the question of updating the Earth's
precession-nutation theory and revising some postulates of the time service,
astronomy, geophysics, satellite navigation, etc.

21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga