JAN 1           : Earth forms

JAN 29 - FEB 11 : Oldest known rocks

MAR 12          : Oldest chemical evidence of life

APR 1-2         : Oldest fossil cells

AUG 17          : First eukaryotes (cells with membranes)

OCT 1-7         : First multicellular organisms (algae)

NOV 12-13       : First animals with shells and limbs

NOV 26          : First animals with vertebrae

NOV 30          : First land plants

DEC 1           : First land animals

DEC 27          : Extinction of dinosaurs

DEC 31          : Homo Sapiens appears (23:00:00)
DEC 31          : Humans set foot on the Moon (23:59:59.75)