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Cosmic calendar (popularized by Carl Sagan)
A timeline in which the entire history of the universe is mapped to a calendar year; 1 second in this calendar equals about 500 years of real history
- January 1, 00:00 Big Bang
- January 22 Formation of galaxies
- March 16 Beginning of the formation of the Milky Way galaxy
- September 2 Formation of the Solar System
- September 21 Origin of life on Earth
- September 30 The emergence of photosynthesis
- November 9 Emergence of complex cells
- December 5 Multicellular life
- December 17 Fish and proto-amphibians
- December 22 Amphibians
- December 24 Reptiles
- December 25 Dinosaurs
- December 27 Birds
- December 30 The first primates
- December 31, 22:24 The first humans
- December 31, 22:44 Domestication of fire
- December 31, 23:52 Modern humans
- December 31, 23:59.32 Agriculture
- December 31, 23:59.55 Roman Empire, the beginning of modern calendar era
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