The date, which unites all people in the profession, was chosen in honor of the events of the 15th century and the outstanding personality of that time - the mathematician Luca Pacioli. He is considered the founder of modern accounting, and his book, published on November 10, 1494, “The Sum of Arithmetic, Geometry, Relations and Proportions,” included a section that for the first time described in detail the accounting affairs of that time.