Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stone circles on the harraat of Syrian desert   Recently some stone structures covering the harraat of the Syrian desert had
been investigated using satellite imagery (arXiv:1106.4665). Dispersed in an
arid landscape, they were probably made during the Neolithic period. Some of
these structures are here discussed, which display a possible use as ancient
sun observatories. For the analysis, a freely available software is used which
can be quite suitable for evaluating the effect of solar radiation on physical
features of natural structures too.

15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an