The Universe in a Year

The American astronomer Carl Sagan who lived during the period of 1934-96 was the first person who suggested a “cosmic calendar” as a way of helping people to understand the history of the Universe. He placed everything into the scale of a calendar year; the galaxies are formed over nine months and the Earth appears in September. All human history is crowded into the last five minutes of the last day of the year. Recent time has to be divided into seconds and fractions of a second. So everything that happened over the last 475 years place in less than the last second of the last minute of the year.