SNAPSHOT: The History of the Universe as a Cosmic Calendar

SNAPSHOT: The History of the Universe as a Cosmic Calendar2

Big bang January 1 13.7 billion years ago
Stars and galaxies begin to form End of January/mid-February 12 billion years ago
Milky Way galaxy forms March/early April 10 billion years ago
Origin of the solar system September 9 4.7 billion years ago
Formation of the earth September 15 4.5 billion years ago
Earliest life on earth Late September/early October 4 billion years ago
Oxygen forms on earth December 1 1.3 billion years ago
First worms December 16 658 million years ago
First fish, first vertebrates December 19 534 million years ago
First reptiles, first trees December 23 370 million years ago
Age of dinosaurs December 24–28 329–164 million years ago
First human-like creatures December 31 (late evening) 2.7 million years ago
First agriculture December 31: 11:59:35 12,000 years ago
Birth of the Buddha/Greek civilization December 31: 11:59:55 2,500 years ago
Birth of Jesus December 31: 11:59:56 2,000 years ago
Aztec and Inca empires December 31: 11:59:59 500 years ago