March 21st is the vernal equinox in 24 solar terms, and it is also the World Sleep Day.

March 21st is the 8th day of the Gregorian calendar year (the 81st day of leap year), and there are 285 days before the end of the year. This day is mostly the "vernal equinox". A global activity initiated by the International Foundation for Mental Health and Neuroscience in 21, and March 21st every year is designated as "World Sleep Day". Its key point is to arouse people's attention to the importance and quality of sleep. China Sleep Research Association officially introduced it to China in 23.

In addition to the vernal equinox, this day can also refer to the following special events:

In p>617, the Wagang army defeated the Sui army, occupied Xingluo warehouse and opened the warehouse to release grain.

1556-The Archbishop of Canterbury, the Anglican Church, was executed at the stake in Oxford because he was regarded as a heresy of Christianity.

in p>184, Napoléon Bonaparte, the first ruling country in France, signed a decree and formally promulgated the French Civil Code. ?

in p>1836, Kolkata public library was opened to the public.

1919-Belo-Kuhn took control of Hungary.

1922-Azerbaijan was annexed by the Soviet Union. ?

1927-the third armed uprising of Shanghai workers.

1934-Hitler planned to build a huge highway system.

1939-Chiang Kai-shek sent special agents to Hanoi to assassinate Wang Jingwei.

1948-The Soviet Union withdrew from the Allied Council in Berlin.

in p>1955, the Central Committee of China held a national congress.

1955-inscription by Mao Zedong: We should build a powerful air force.

1955-the first discovery of paleontological fossils 3 million years ago in China.

196-A genocide occurred in Sharpeville, South Africa.

1962-Nordic Council was established.

1971-Vietnam withdrew its troops from Laos.