Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The winter day as a constraint for human activity in Western Europe   Time use surveys in Denmark, Spain, France, Ireland, Italy and United Kingdom
are analyzed to provide start, noon and end times for the main activities of a
society: labor (the focus of this preprint), sleeping and eating. Also, the
location at home is analyzed. Local times are converted into mean solar times
and compared to latitude. Observed trends allow to unveil the winter day as a
restriction for the human activity. Alternatively, apparently large time
differences set forth by clocks, becomes smaller when observed as a time
distance to winter sunrise or sunset.

21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph