Q. When is a week not a week A. When it's yn Cymraeg!

There are two things at play here.

  1. In ancient Celtic culture, the day began at sundown.
  2. It took Europe a while to figure out the concept of zero, so they started counting with one marking the beginning rather than zero.

So if you take these into account the span of one week will have 8 nights in it.

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