Constitution Day is observed in Lithuania every October 25 to commemorate the adoption of the country's constitution in 1992. Although it is not a public holiday, special events are organized to celebrate this significant occasion. The constitution was developed over two years following Lithuania's declaration of independence from the Soviet Union in 1990, replacing the provisional constitution that had been based on Soviet principles. A constitutional referendum held on October 25, 1992, resulted in 75% of voters favoring the new constitution, which established the framework for the government of the Republic of Lithuania and defined the fundamental rights and freedoms of its citizens. The Constitution of the Republic of Lithuania serves as the supreme law, outlining the authority of the Seimas (parliament), the President, the Government, and the judiciary.