January 20：Martyrs' Day in Azerbaijan (1990)
January 20 is the 20th day of the year in the Gregorian calendar. There are 345 days remaining until the end of the year (346 in leap years).
In the ancient astronomy, it is the cusp day between Capricorn and Aquarius. In some years it is Aquarius, but others Capricorn. It depends on solar term Dahan (Major cold).
Event：
250 – Emperor Decius begins a widespread persecution of Christians in Rome. Pope Fabian is martyred.
649 – King Chindasuinth, at the urging of bishop Braulio of Zaragoza, crowns his son Recceswinth as co-ruler of the Visigothic Kingdom.
1265 – The first English parliament to include not only Lords but also representatives of the major towns holds its first meeting in the Palace of Westminster, now commonly known as the "Houses of Parliament".
1320 – Duke Wladyslaw Lokietek becomes king of Poland.
1356 – Edward Balliol surrenders his claim to the Scottish throne to Edward III in exchange for an English pension.
1523 – Christian II is forced to abdicate as King of Denmark and Norway.
1567 – Battle of Rio de Janeiro: Portuguese forces under the command of Estácio de Sá definitively drive the French out of Rio de Janeiro.
1576 – The Mexican city of León is founded by order of the viceroy Don Martín Enríquez de Almanza.
1649 – Charles I of England goes on trial for treason and other "high crimes".
1783 – The Kingdom of Great Britain signs a peace treaty with France and Spain, officially ending hostilities in the American Revolutionary War(also known as the American War of Independence).
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