22-DEC - National Mathematics day
It is celebrated in order to honor the birth anniversary of the famous mathematician Sir Srinivasa Ramanujan.
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Dec-21
December 21 is often the shortest day of the year and is sometimes regarded as the first day of winter. In the Southern Hemisphere, December 21 is often the longest day of the year and occurs during the southern summer.
18-12 International Migrants day
On December 4, 2000, the General Assembly of the United Nations proclaimed December 18th as International Migrants Day. They did so due to the increasing number of migrants in the world. December 18th was chosen because it was on this date in 1990 that the Assembly adopted the International Convention on the Protection of the Rights of All Migrant Workers and Members of their Families.