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B.C. (before Christ) and A.D. (after death)(relating to after Christ died) are the two broad spans that divide earth's history, with a 33 year span between B.C. and A.D. because 33 years is the age of Christ, and no one can decide where B.C. should end and A.D. should start, so they leave a blank thirty three years of unknown.

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βˆ™ 15y ago
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βˆ™ 5mo ago

Earth's history is typically divided into the Precambrian eon, which spans from the formation of the Earth about 4.6 billion years ago to around 541 million years ago, and the Phanerozoic eon, which covers the time from around 541 million years ago to the present day.

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Q: What two broad spans of time divide earth's history?
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