Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stellector: a laser aided night sky explorer for teaching astronomy   We present a device, created by us and named Stellector, composed by a laser
pointer which is precisely guided by two step motors with the purpose to
explore and teach astronomy concepts having the real night sky in the
background. The electronic part is made of low cost items and the mechanical
part is 3D printed. The controller software was written in HTML/Javascript
language in order to run in any portable communication device, such as
smartphones and tablets. Communication with the Stellector hardware is via
Bluetooth standard. These characteristics ensure the necessary portability and
autonomy for outdoor astronomy teaching activities. In this work, we sketch the
Stellector design and its mode of operation. We also illustrate some teaching
activities involving basic night sky observations and astronomy concepts.
Finally, we discuss the device limitations, its accuracy and further
improvements.

1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph