\begin{definition}[Definition:Ludolphine Number/Historical Note]
{{AuthorRef|Ludolph van Ceulen}} published a $20$-decimal approximation for pi in his $1596$ book ''Van den Circkel'' ("On the Circle").
He later expanding this result to $32$ decimal places, and finally to $35$ decimal places.
He did not live to see the $35$-decimal-place value published, but it was carved onto his tombstone in a churdhyard in Leyden.
The church was subsequently rebuilt and his tomb was destroyed, but his epitaph had by then been recorded in a survey of Leyden. Hence his lifework was preserved.
He obtained his value by using {{AuthorRef|Archimedes}}' technique, taking the number of sides of the inscribed and circumscribed polygons to be $2^{62}$.
{{MissingLinks|Needs a link to that exact technique. Work in progress.}}
\end{definition}