Each of the six days in Schroeder's Genesis actually takes a different length of earth time. The duration D, in earth days, of each cosmic day t is calculated from the formula D = (Ao/L)exp(-Lt), where Ao = 4x1012 (the ratio of the frequencies of the cosmic microwave background at quark confinement compared to now) and L = 0.693 (natural log of 2). More simply, cosmic day one is 8 billion earth years long and you divide by two to get the duration of each succeeding cosmic day.
Cosmic day one starts 15.75 billion earth years ago and covers the creation of the universe, the "breaking free" of light as electrons bind to atomic nuclei, and the beginning of galaxy formation. This is described in Gen. 1:1-5 as the creation followed by light separating from the darkness.
Cosmic day two starts 7.75 billion earth years ago and lasts four billion earth years. During this period the stars and galaxies are born. This corresponds to Gen. 1:6-8, the formation of the heavenly firmament.
Cosmic day three starts 3.75 billion earth years ago. During two billion earth years, the earth cools, water appears, and the first life forms appear. In Gen. 1:9-13, vegetation first appears during the third day.
Cosmic day four starts 1.75 billion earth years ago and lasts a billion earth years. The earth's atmosphere becomes transparent and photosynthesis produces an oxygen-rich atmosphere. Schroeder says that this corresponds to Gen. 1:14-19 when "the Sun, Moon, and stars become visible in the heavens" (67).
Cosmic day five starts 750 million earth years ago and lasts 500 million earth years. During this period, the first multicellular animals appear and the oceans swarm with life. Gen. 1:20-23 says the waters bring forth swarms of living creatures and "birds fly above the earth" (94).
Cosmic day six starts 250 million years ago and ends at the time of Adam. During this period we have a massive extinction in which 90 percent of life is destroyed and then repopulated with humanoids and humans. This, Schroeder says, corresponds to what is described in Gen. 1:24-31.
Technically, Schroeder's formula gives the present as the end of the sixth day. However, it could just as well have ended a few thousand years ago and not affect the rest of the calculation where things are rounded off at hundreds of millions of years. Schroeder argues that after the six cosmic days of creation, Genesis switches its focus over to humanity and starts measuring time in human terms. The rest of the Bible concerns itself with the 6,000 earth years since Adam and Eve, estimated from the Bible in Bishop Ussher fashion.
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