The Cosmic Calendar is a scale in which the 13.7 billion year lifetime of the universe is mapped onto a single year. At this scale the Big Bang took place on January 1 at midnight, and the current time is mapped to December 31 at midnight. At this scale, there are 434 years per second, 1.57 million years per hour, and 37.7 million years per day. The concept was popularized by Carl Sagan in his book The Dragons of Eden and on his television series Cosmos as a way to conceptualize the vast amounts of time in the history of the universe.
Big Bang
| Date | bya | Event |
|---|---|---|
| 1 Jan | 13.7 | Big Bang, as seen through cosmic background radiation |
| 11 May | 8.8 | Milky Way Galaxy formed |
| 1 Sep | 4.57 | Sun formed (planets and Earth's moon soon thereafter) |
| 16 Sep | 4.0 | Oldest rocks known on Earth |
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