On December 9th:

 1965  A Charlie Brown Christmas Premieres

On this festive day in 1965, the beloved animated special “A Charlie Brown Christmas” made its debut on television, becoming an instant classic and capturing the hearts of audiences worldwide.

 1979  Smallpox is Declared Eradicated

A momentous achievement in public health occurred on December 9th, 1979, when the World Health Organization (WHO) officially declared smallpox eradicated, marking the first disease to be eliminated by human effort.

 1992  Charles and Diana Announce Separation

On this day in 1992, the British Prime Minister John Major announced the official separation of Charles, then the Prince of Wales and heir to the British throne, and his wife, Princess Diana.