1. World Civ

2. The Dating of Time Have you ever given much thought to time? How important are dates and time to your daily life?

3. If you were asked the question: “What year were you born,” each of you would automatically respond with a number (1998 or 1999). But have you actually thought about what this number means??? If you were asked the question: “What year were you born,” each of you would automatically respond with a number (1998 or 1999). But have you actually thought about what this number means???

4. In our system of dating, events are dated by counting backward or forward from the birth of Christ (the year “1”). In our system of dating, events are dated by counting backward or forward from the birth of Christ (the year “1”). Events that occurred before the birth of Christ are labeled “BC” Events that occurred before the birth of Christ are labeled “BC” Events that occurred after the birth of Christ are labeled “AD” Events that occurred after the birth of Christ are labeled “AD” anno domini – “in the year of our Lord” anno domini – “in the year of our Lord” Some historians/books use BCE and CE instead. Some historians/books use BCE and CE instead.

5. The year of my birth is AD 1982. The year of my birth is AD 1982. This means I was born 1,982 years after the birth of Christ. This means I was born 1,982 years after the birth of Christ. An event that happened 400 years before the birth of Christ would be dated 400 B.C. An event that happened 400 years before the birth of Christ would be dated 400 B.C. Terms: decade=10 years Terms: decade=10 years century= 100 years century= 100 years millenium= 1,000 years millenium= 1,000 years

6. Understanding Centuries 100 BC – 1 BC = 1 st century BC 200 BC – 101 BC = 2 nd cent BC 300 BC – 201 BC = 3 rd cent BC 400 BC – 301 BC = 4 th cent BC Etc…

7. 1 – 100 = 1 st century 101 – 200 = 2 nd century 201 – 300 = 3 rd century … 1801 – 1900 = 19 th century 1901 – 2000 = 20 th century 2001 – 2100 = 21 st century Why do you need to know this anyway?

8. http://isotropic.org//date/ We use the Gregorian Calendar (after Pope Gregory XIII) (1582) We use the Gregorian Calendar (after Pope Gregory XIII) (1582) But not all people use this calendar system. What other calendar systems are used? But not all people use this calendar system. What other calendar systems are used? What’s the difference between the Julian and Gregorian calendars? What’s the difference between the Julian and Gregorian calendars?

9. The Gregorian Calendar was first introduced by Pope Gregory XIII - which is how the calendar got its name. This calendar has been implemented by several countries because the Julian calendar assumes a full year is 365.25 days whereas it is actually 11 minutes less. So, the Julian calendar many countries felt wasn't a true year so they made the change. The Gregorian calendar was able to make up for this 11 minute difference by not making years divisible by 100 to be a leap year.

10. Other Calendars include: used by the Igbo people Igbo calendar used by the Igbo peopleIgbo people Igbo calendarIgbo people Ibibio calendar used by the Ibibio people Ibibio calendar used by the Ibibio people Ibibio calendar Ibibio people Ibibio calendar Ibibio people Juche era calendar used by North Korea Juche era calendar used by North Korea Juche era calendar North Korea Juche era calendar North Korea Xhosa calendar (in use in South Africa) Xhosa calendar (in use in South Africa) Xhosa calendar Xhosa calendar Yoruba calendar (in use in Nigeria Yoruba calendar (in use in Nigeria Yoruba calendar Yoruba calendar

11. For Future Reference

12. Formative Assessment Complete the following questions: Complete the following questions: 1.) What century were you born in? 2.) Queen Elizabeth I died in 1603. Which century is this? 3.) Thomas Edison invented the light bulb in the 19 th century. What years?

13. Exit Ticket 4.) Why did the Gregorian calendar replace the Julian calendar? 4.) Why did the Gregorian calendar replace the Julian calendar? 5.) How would you correctly write King Henry the 8 th using Roman Numerals? 5.) How would you correctly write King Henry the 8 th using Roman Numerals? 6.) Louis XIV is what number? 6.) Louis XIV is what number?