Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Chinese Pyramids and the Sun   The Chinese Pyramids are huge ancient burial mounds. In the satellite images
we can see some complexes where the main buildings are the pyramidal mounds of
an emperor and his empress. Here we discuss a possible sunrise/sunset
orientation of these two pyramids on the solstices and equinoxes.

15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat