Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fast Determination of Constellation Membership   The 88 constellations as defined by the IAU segment the sky into regions,
separated by an intricate set of boundaries. A binary tree decomposition of
this landscape is given which tessellates the celestial sphere into rectangles.
This allows a fast determination of the constellation membership of any given
sky coordinate.

3
The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
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The categories of this paper are: eess
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
2
The categories of this paper are: math
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The categories of this paper are: q-fin
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The categories of this paper are: stat
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci