Overall this is a great article, but it has quite a few historical misconceptions. One blatant example:<p><pre><code> > In the present context, the names of the Roman months have been adopted by all
> Western languages, while the names of days of the week have more recent and
> diverse names, probably because weeks are a fairly recent concept.
</code></pre>
The seven-day week had been a concept for least a millennia before the current Roman-derived names of the months.