Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discretization on the cosmic scale inspired from the Old Quantum
  Mechanics   The Old Quantum Mechanics actions discretization rules for periodic motions
on the atomic scale (Bohr-Sommerfeld) have been suitably modified in order to
account the gravitational field instead of the electrostatic one. The new rules
are used to calculate a few mechanical quantities pertinent to the periodic
motions of celestial bodies. Several values have been obtained which result in
reasonable agreement with the corresponding experimental data. A gravitational
dimensionless structure constant has been determined, using the data relative
to the solar sistem, which allows to quantitatively account for phenomena on a
much wider scale. In particular, some information is acquired about the
recently discovered extrasolar planetary systems and about the general
empirical law which connects the spin of a celestial body with the square of
its mass.

26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys