1. Copy HW Start page 15 of your notebook by explaining how historians keep track of time

2.  Historians divide time in to ____________ or _____________.  10 yrs.=______________________  100yrs.=______________________  1000 yrs.=________________________

4.  Calendar-dating system  “B.C.”-”before Christ”  BCE-Before common era  “A.D.” anno domini-”in the year of our Lord”  CE-Common Era

11.  1. How many years ago was the year 3467 B.C.  2. How many years did the Barno empire last, if it began in 356 B.C. and ended in 123 BCE?  3. How many years ago was the year A.D. 1555?  4. What year was it 589 years before 2344 BCE?