The Cosmic Calendar

Astrophysicist Carl Sagan is responsible for one of the most moving, evocative speeches i have ever heard. His 'Pale Blue Dot' oration about how our Earth has hosted everyone you love, know, ever heard of, who ever was and how our Planet is the only home we have ever known and we have nowhere else to go so we should preserve and cherish the pale blue dot is brilliant.
As well as one of the greatest ever expressions, he also gave us the 'The Cosmic Calendar' where he took all of history and compressed it into a single year.
He placed the 15 billion-year history of the universe in context placing the origin of the universe on January 1, the formation of Earth on September 14, the origin of microbes on October 9, the appearance of dinosaurs on December 24, and the appearance of humans at 10:30 p.m. on December 31.

January 1    Big Bang
May 1        Origin of the Milky Way Galaxy
September 9    Origin of the Solar System
September 14    Formation of the Earth
September 25    Origin of life on Earth
October 2    Formation of the oldest rocks on Earth
November 1    Invention of sex (by microorganisms)
November 12    Oldest fossil photosynthetic plants
November 15    Eucaryptes (first cells with nuclei flourish)
December 1    Oxygen forms on Earth
December 24    First dinosaurs
December 31, 10:30 p.m.    First humans
11:59:20 p.m.    Invention of agriculture
11:59:59 p.m.    Renaissance in Europe
January 1 (Second year) 12:00 a.m.    Widespread development of science, medicine, and technology