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Today is a date that only comes around once every 100 years. PI day is celebrated annually on 14th March, because the American formulation of the date “3/14” forms the first three digits of π, or pi, which is 3.14. The Welsh Government is trying to adopt Pi Day for its own. Welshman William Jones became the first person to use the Greek letter π to represent Pi in 1706. The Welsh government wants to mark that with Pi Day Cymru. Professor Sarah Hart is a lecturer at Birkbeck University who loves the symmetry in Pi: ‘You have the two simplest things you can measure, how long a circle is around the outside and how wide it is, you divide one by the other and you always get the same answer, Pi, and that’s not true of other shapes’.