Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How the Vikings Navigated With the Sun   The students are introduced to navigation in general, and, in particular, the
skills the medieval people of the Vikings used to navigate on the open sea. The
topics of navigation and the Vikings are introduced by questions and a short
story. A hands-on activity illustrates to the students how the navigational
tool of the shadow board might have helped the Vikings to determine the
cardinal directions and to sail along latitude. A miniature version of a shadow
board simulates how the shadow cast by the Sun was probably used for this.
Finally, a simple math activity for more experience students demonstrates the
geometry that is involved in that technique.

5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs