According to the Law of Ukraine, in cases where a public holiday falls on the weekend (Saturday or Sunday), the weekend is extended by one day.
Red marks the official holidays wich are days off.
Brown marks the official holidays which are working days.
Green marks the celebrations, which change date.
21 December
• In Donetsk (formerly Stalino), Ihor Pavlov (1934/12/21 – 2010/11/24) was born – engineer and industrial personality in the Soviet Union, and then in Ukraine; Graduate of technical science (1977), academic at the Ukrainian Academy of Engineering (1995), professor (2000), chief technologist (1971-2001), then vicegeneral designer for technological efficiency at the Aerospace and Technical Complex, named after Oleg Antonov (2001 November 2010). Honored Airplane Builder (1984), Honored Engineer in Ukraine (1994).
• Establishment of «Public Committee in defense of Nina Strokatova» (1971).
• AN-225 «Maria» made its first flight (1988).