Based on Carl Sagan's "Cosmos", the Cosmic Calendar is a model that compares the 13.8 billion year history of the universe to a single calendar year. In the Cosmic Calendar, January 01 represents the Big Bang, and December 31 represents "now." In this model, the earth and sun appear around the beginning of September. In this activity, students will be able to construct a poster of the Cosmic Calendar. They will compute the Calendar dates for major events in the history of the universe, and they