To quote:

"The Cosmic Clock will help you to explore the birth and development of our cosmos.

Spanning some 15 billion years, the clock highlights significant events that occurred along the history of the universe as described by modern cosmological theory.

This tour through time, although brief, is one in which all members of our civilization should be familiar.

After all, humans have endeavored to understand our beginnings for eons. Now, we are finally beginning to know!"

http://www.cosmicvoyage.org/museum/h1c_cosmicclock.htm

Carl Sagan also produced the Cosmic Calendar, compressing the history of
the Universe into one year. All of human history is in the last second of the
last day of that Cosmic Year.

http://school.discovery.com/schooladventures/universe/itsawesome/cosmiccalendar/page2.html

http://www.physics.sfsu.edu/~dlamenti/links/cosmiccal.html