The way the Earth changes its tilt. See 'A Brief History of Climate Change'.
Obliquity
Fact of the Day
The diet of the average person in 13th century England probably contained between 1,500 and 1,650 calories per day.
Quote of the Day
"Is life not a hundred times too short - to get bored?
"
~ Nietzsche
On This Day
1314 The Scottish army, led by Robert the Bruce, won a decisive landmark victory over Edward II's English at the Battle of Bannockburn.
1509 Henry VIII and Catherine of Aragon enjoyed a lavish joint coronation at Westminster Abbey. Thirteen days after their low-key wedding, it was intended to be their big celebration.
1519 Lucrezia Borgia, daughter of Pope Alexander VI, died, ten days after giving birth to her tenth child. To history, she is known - with no evidence - as a poisoner, but she was a powerful woman in her own right and reigned as the Governor of Spoleto, a position usually held by cardinals.
1812 Napoleon’s Grand Army crossed the Nieman River, beginning the ill-fated invasion of Russia. Despite gaining considerable land during the summer, the Army was defeated and pushed out of Russia within six months.
1947 Private pilot Kenneth Arnold reported what is widely thought to be the first post-war UFO sighting, of nine shiny objects speeding past Mount Rainier at about 1,200 mph.
1948 The Soviet Union began the Berlin Blockade, blocking the Western Allies' transport access to West Berlin following the introduction of the Deutsche Mark. It was the first key East-West conflict of the Cold War.
