The Cosmic Calendar

In this excerpt from the first episode of his TV series Cosmos, Carl Sagan imagines how the history of the universe would look if set against a regular Gregorian calendar:

We on Earth have just awakened to the great oceans of space and time from which we have emerged. We are the legacy of 15 billion years of cosmic evolution. We have a choice: We can enhance life and come to know the universe that made us, or we can squander our 15 billion-year heritage in meaningless self-destruction. What happens in the first second of the next cosmic year depends on what we do, here and now, with our intelligence and our knowledge of the cosmos.

– Carl Sagan