1. Understanding Timelines Unit 0

2. Timeline Human history is divided into 2 parts, called BC and AD. BC AD

3. BC stands for Before Christ AD stands for Anno Domini, which means “in the year of the Lord.” Timelines are like number lines, the numbers count down to 1 AD and then they count up.

4. Because BC and AD are a Christian based numbering system some people don’t like to use them. Instead, they use the same numbers, but use the letters BCE and CE. BCE stands for Before Common Era CE stands for Common Era