A Chronology of the Earth

EventDateTimeYears Ago
Big Bang Jan. 1 12:00 AM13,700,000,000 yr
CMB forms Jan. 1 12:10:30 AM13,699,700,000 yr
Galaxies form Jan. 24 12:00 AM12,700,000,000 yr
Sun forms Sept. 13 noon 4,500,000,000 yr
Earth forms Sept. 13 12:17 PM 4,400,000,000 yr
1st life appearsOct. 24 8:48 PM 2,800,000,000 yr
1st higher formsDec. 19 3:07 AM 570,000,000 yr
1st land animalsDec. 25 4:29 AM 280,000,000 yr
1st dinosaurs Dec. 26 12:36 PM 225,000,000 yr
Dinos Rule! Dec. 28 4:34 PM 136,000,000 yr
Dinos Die! Dec. 29 10:02 PM 65,000,000 yr
Earliest "human"Dec. 31 9:05 PM 5,000,000 yr
Neanderthal - CMDec. 31 11:50 PM 300,000 yr
Last Ice Age Dec. 31 11:59:37 PM 11,000 yr
Pyramids Dec. 31 11:59:53 PM 3,500 yr
USA Dec. 31 11:59:59.6 PM 220 yr
You Dec. 31 11:59:59.96 PM 20 yr

In the table above, the time from the Big Bang until today is compressed into one year; it is a scale model of the time history of universe with a scale of 1/13,700,000,000. Adapted from The Evolution of Life, by Frank H.T. Rhodes.