Unofficial ceasefires sprang up across World War I’s Western Front.
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The crew of NASA's Apollo 8 became the first humans to enter the Moon's orbit.
King George I established the Greek Presidential Guard as the royal escort.
The Christmas carol 'Silent Night' composed by Franz Xaver Gruber was first sung at St Nicholas parish church in Oberndorf, Austria.
Jan van Riebeeck departed for Cape of Good Hope to found the first permanent European settlement.
Several Confederate veterans formed the Ku Klux Klan in Pulaski, Tennessee.