Cosmic calendar was popularized by Carl Sagan in his book The Dragons of Eden and on the television series Cosmos
Cosmos video presented by Carl Sagan
Cosmos A Spacetime Odyssey video presented by Neil deGrasse Tyson
![](https://upload.wikimedia.org/wikipedia/commons/thumb/9/99/Cosmic_Calendar.png/800px-Cosmic_Calendar.png)
Cosmic calendar was popularized by Carl Sagan in his book The Dragons of Eden and on the television series Cosmos
Cosmos video presented by Carl Sagan
Cosmos A Spacetime Odyssey video presented by Neil deGrasse Tyson