January 6 is day 6 of the Gregorian Calendar year,
Sweetmorn, Chaos 6, 3186 YOLD (Discordian)
And let us not forget 13.0.7.2.12 by the Mayan Long Count

On this day in history:

1066 – The Witan met to confirm Harold Godwinson as King of Engelonde, leading to counter claims, hurt feelings and the Norman Conquest.

1492 – Their Catholic Majesties Ferdinand and Isabella entered Granada, loosing great horror upon the world.

1721 – The Committee of Inquiry on the South Sea Bubble published its findings. A most amusing and educational event, the Wiki summarizes said bubble, in part, thusly:

The South Sea Company (officially The Governor and Company of the merchants of Great Britain, trading to the South Seas and other parts of America, and for the encouragement of fishing)[3] was a British joint-stock company founded in 1711, created as a public-private partnership to consolidate and reduce the cost of national debt. The company was also granted a monopoly to trade with South America and nearby islands,
...
There was no realistic prospect that trade would take place, and the company never realised any significant profit from its monopoly. Company stock rose greatly in value as it expanded its operations dealing in government debt, peaking in 1720 before collapsing to little above its original flotation price;

...
a considerable number of people were ruined by the share collapse, and the national economy greatly reduced as a result. The founders of the scheme engaged in insider trading, using their advance knowledge of when national debt was to be consolidated to make large profits from purchasing debt in advance. Huge bribes were given to politicians to support the Acts of Parliament necessary for the scheme.[4] Company money was used to deal in its own shares, and selected individuals purchasing shares were given loans backed by those same shares to spend on purchasing more shares. The expectation of profits from trade with South America was used to encourage the public to purchase shares, but the bubble prices reached far beyond the profits of the slave trade.

-- To clarify, the trade envisioned was to be trade in enslaved persons, and such trade was carried out, but not at all profitably. Today these types of scams are the province of Private Equity Firms, which usually use a pre-existing company as a vehicle for their scams and schemes.

1847 – Samuel Colt landed his first contract to provide revolvers to the US military.

1893 – The Washington National Cathedral was chartered by Congress because you can't have Freedom of Religion without one..

1941 – FDR delivered his Four Freedoms speech, enumerating 4 basic rights that all persons everywhere should enjoy. Perhaps we may yet enjoy them here, but don't hold your breath.

Born this day in:

1412 – Joan of Arc, seer, witch, martyr, saint, kingmaker, etc.

1832 – Gustave Doré, painter and sculptor

1872 – Alexander Scriabin, pianist and composer

1878 – Carl Sandburg, poet and composer

1883 – Kahlil Gibran, poet, painter, and philisopher

1912 – Jacques Ellul, philosopher and critic

1915 – Alan Watts, philosopher and author

1924 – Earl Scruggs, banjo player

1931 – E. L. Doctorow, author and playwright

 
1955 – Susan B. Horwitz, computer scientist

Died this day in:

1852 – Louis Braille, educator and inventor of braille

1884 – Gregor Mendel, botanist and geneticist

1918 – Georg Cantor, mathematician

1944 – Ida Tarbell, journalist, reformer, muckraker, and educator

1990 – Pavel Cherenkov, physicist

1993 – Dizzy Gillespie, trumpet player, singer, and songwriter

1993 – Rudolf Nureyev, dancer and choreographer

2000 – Don Martin, cartoonist

2006 – Lou Rawls, singer and songwriter

2007 – Sneaky Pete Kleinow, guitarist and songwriter

2017 – Tilikum, imprisoned orca

Holidays, Holy Days, Festivals, Feast Days, Days of Recognition, and such:

Apple Tree Day, Bean Day, Cuddle Up Day, Shortbread Day, Technology Day, and Take a Poet to Lunch Day

Music goes here, iirc, well, With apologies