Once the planet had been properly prepared, the earth was ready for its clocks. There must be a time-keeping system for “signs and seasons, and for days and years.” What did God originally say about the purpose of the heavenly lights? And why were the events on the fourth day significant?

Other episodes in this series:

Introduction and Day One—The Tri-Universe

Day Two—The Firmament

Day Three—Land and Seas

Day Three—Plants and "Kinds"

Day Five—Sea Cucumbers to Sea Monsters

Day Five—Soaring Birds to Scary Pterodactyls

Day Six—Cattle, Beasts of the Earth, and Creeping Things

Day Six—Made in God's Image

Day Six—Man as God's Steward

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