5. Use the numbers from #2 to determine the time BACKWARDS from midnight (24:00) on "December 31st" and then the Calendar date and time on your cosmic calendar for each of the following events. Show a sample calculation.
Sample Calculation for an event happening 4.3 X 109years ago
4.3 X 109years ago / 4.1 X 107y/cal. day = 104.88 cal. day = 104 cal. days
so 104 days - 31 days (Dec.) - 30 days (Nov) - 31 days (Oct) = 12 days
Sep 30 - 12 days = Sep 18

Important Events on Earth
Event Years ago from Today Days ago Cal. Date
Layers of Earth form 4.3 X 109 104.88 9/18
Bombardment by Planetesimals stops 4.0 X 109 . /
Life Evolves on Earth 3.8 X 109 . /
Earth's Atmosphere Has Oxygen 2 X 109 . /
Complex Cells Evolve 1.5 X 109 . /
Multicellular Organisms Appear in Fossil Record 6.0 X 108 . /
Rise of fish (first vertebrates) 5.0 X 108 . /
First Land Plants 4.3 X 108 . /
First Land Animals (millipedes) 4.2 X 108 . /
First Insects 3.5 X 108 . /
Rise of Amphibians 3.5 X 108 . /
Rise of Reptiles 3.0 X 108 . /
Permian Mass Extinction 2.5 X 108 . /
First Dinosaurs 2.15 X 108 . /
First Mammals 2.0 X 108 . /
First Birds 1.55 X 108 . /
First Flowering Plants 1.15 X 108 . /
Dinosaur Extinction 6.5 X 107 . /
First primate 6 X 107 . /

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