1. Using Timelines to Understand History

2. The Gregorian Calendar Invented by the Romans. Improved by Pope Gregory XIII – he added Leap Year. Events are relative the date that Christians believed Jesus was born.

3. Other Calendars It is currently the year: 2014 on the Christian calendar 5775 on the Hebrew calendar 1435 AH on the Islamic calendar Year of the Horse on the Chinese calendar

4. The Gregorian Calendar BC = “Before Christ” AD = “Anno Domini” – No, it does not mean “after death”. – Latin meaning: “the year of our lord”. – This year is 2014 years since Christians believe Jesus was born.

5. The New System BCE means “Before the Common Era” 44 BCE = 44 BC CE means “Common Era” 2014 CE = 2014 AD

6. Similar to Number Lines 0-212 1 CE2 BCE1 BCE2 CE3 CE

7. Relative Time YA = “years ago” Dinosaurs died out 65 million YA Earliest humans: 4 million YA

8. Rough Estimates of Dates Ca. = circa = “around the time of” Remember: circa sounds like “circle” which is round. First stone tools were made ca. 2 million years ago.

9. http://nationalgeographic.com