Celebrated every year on December 10.
Dewey Decimal System Day celebrates the birthday of Melvil Dewey (1851-1931) inventor of the Dewey Decimal system of library classification.
The Dewey decimal system is a numerical system used in organizing library books.
Because books are for several reasons hard to organize by a simple linear system, another system that “1, 2, 3, etcetera” had to be used.
It makes sense to librarians what the Dewey Decimal System is
and how it is used and it makes their life easier
and therefore it also makes the readers happy.