Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Further progress on solar age calibration   We recalibrate a standard solar model seismologically to estimate the
main-sequence age of the Sun. Our procedure differs from what we have done in
the past by removing from the observed frequencies the effect of hydrogen
ionization and the superadiabatic convective boundary layer. Our preliminary
result is $t_\odot=4.63 \pm 0.02$ Gy.

18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph