The Day of Polish Statistics is observed in Poland every March 9 to recognize and thank Polish statisticians for their contributions. Established in December 2008, this day commemorates the anniversary of a session of the Four-Year Sejm in 1789, where economist Fryderyk Józef Moszyński advocated for a statistical census of Polish territories. The holiday is a joint initiative of the General Council of the Polish Statistical Association, the Committee on Statistics and Econometrics of the Polish Academy of Sciences, and the President of Statistics Poland. It aims to promote statistics as a scientific discipline and inform the public about advancements in statistical knowledge. Statistics Poland, the main government agency for statistical information, plays a crucial role in providing accessible data reflecting the country's social and economic life. The day serves as a professional holiday for those involved in the field of statistics in Poland.