World Civ
Bell Work:

Pick up a paper on determing
the most reliable sources from
the podium and quietly read and
complete it.
The Dating of Time
Have you ever given much
thought to time?
How important are dates and time
to your daily life?
 If
you were asked the
question: “What year
were you born,” each of
you would automatically
respond with a number
(1999 or 2000). But have
you actually thought
about what this number
means???
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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 after the
birth of Christ are labeled “AD”
anno domini – “in the year of our
Lord”
 Some historians/books use BCE
and CE instead.

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The year of my birth is AD 1967.
This means I was born 1,967
years after the birth of Christ.
An event that happened 400
years before the birth of Christ
would be dated 400 B.C.
Terms: decade=10 years
century= 100 years
millenium= 1,000 years
Understanding Centuries
100 BC – 1 BC = 1st century BC
200 BC – 101 BC = 2nd cent BC
300 BC – 201 BC = 3rd cent BC
400 BC – 301 BC = 4th cent BC
Etc…
1 – 100 = 1st century
101 – 200 = 2nd century
201 – 300 = 3rd century
…
1801 – 1900 = 19th century
1901 – 2000 = 20th century
2001 – 2100 = 21st century
Why do you need to know this
anyway?
http://isotropic.org//date/
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We use the Gregorian Calendar
(after Pope Gregory XIII) (1582)
But not all people use this
calendar system. What other
calendar systems are used?
What’s the difference between
the Julian and Gregorian
calendars?
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.
Other Calendars include:
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Igbo calendar used by the Igbo
people
Ibibio calendar used by the
Ibibio people
Juche era calendar used by
North Korea
Xhosa calendar (in use in South
Africa)
Yoruba calendar (in use in
Nigeria
For Future Reference
Complete the handout on
BC/AD
Formative Assessment
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 19th century.
What years?

Exit Ticket
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4.) Why did the Gregorian
calendar replace the Julian
calendar?
5.) How would you correctly
write King Henry the 8th using
Roman Numerals?
6.) Louis XIV is what number?