Time How do we measure time? When was 3,000,000 years ago? What is a timeline?
Time
How do we measure time?
When was 3,000,000 years
ago?
What is a timeline?
Time
•Time has units of measurement
UNIT SIZE
Second
Minute 60 seconds
Hour 60 minutes
Day 24 hours
Week 7 days
Fortnight 14 days, 2 weeks
Month Between 28 and 31 days
Quarter 3 months
UNIT SIZE
Year 12 months
Olympiad 4 years
Lustrum 5 years
Decade 10 years
Indict 15 years
Generation 25 years
Century 100 years
Millennium 1000 years
Epoch, Period, Era, Eon
Time
•Time has units of measurement
•Time measurements are culture specific
•Not all measurements are appropriate for
prehistory or ancient history
•260,000 weeks ago was what date?
•3,000 BC
•Time can be measured with concepts
Time
Geological Time
Cambrian
Ordovician
Silurian
Devonian
Carboniferous
Permian
Triassic
Jurassic
Cretaceous
Tertiary
Cultural Time
Pre-history
Old Stone Age
New Stone Age
Ancient
Classical
Middle Ages
Modern
Industrial
Time
Paleolithic
Mesolithic
Neolithic
Copper
Bronze
Iron
Steel
Computer
2,000,000 years ago
10,000 years ago
8,000 years ago
7,000 years ago
5,500 years ago
3,200 years ago
200 years ago
60 years ago
Technological Time
Time
January 1, 2000
TimeCalendar Date
Gregorian January 1, 2000
Babylonian Year 2749
Buddhist Year 2544
Chinese Cycle 78, year 16 (Ji-Mao), month 11 (Wu-Yin), day 25 (Wu-Wu)
Egyptian Year 6236
Ethiopian 23 Takhsas 1993
French Décade II, Duodi de Nivôse de l'Année 208 de la Révolution
Greek 22 Kiyahk 1716
Hebrew 23 Teveth 5760
Islamic 24 Ramadan 1420
Julian 19 December 1999
Mayan Long count = 12.19.6.15.0; tzolkin = 9 Ahau; haab = 8 Kankin
Persian 11 Dey 1378
Time
Why????
Calendar Dating point
Hebrew Creation of world
Islamic Year of the hijira
French Date of French Revolution
North Korea Birth of Kim Il-Sung
Buddhist Birth of Sidhartha
Western culture ??????????
Time
Dionysius Exiguus “Dennis the
Little (Humble)” 470-544
•Future dates on which Easter would fall
•"the consulship of Probus Junior [Flavius
Probus]“
•"since the incarnation [conception] of our
Lord Jesus Christ“
•25 March 1 AD
•'Anno Domini Nostri Iesu Christi' ('In the
Year of Our Lord Jesus Christ')
Time
Anno Domini
“In the Year of our Lord” A. D.
Before Christ B. C.
Before the Common Era B. C. E.
The Common Era C. E.
B. C. = B. C. E. A. D. = C. E.
Time
Timeline
•A representation of
•key events
•within a historical period,
•arranged chronologically.
Time
oldest most recent
end point end point
Time
0100 100200 200300 300
BC/BCE AD
Time10,000 BC Neolithic Revolution
3100 BC Upper and Lower Egypt United
2670 BC First Dynasty of Ur
2500 BC Mohenjo-Daro
1500 BC Shang Dynasty
2000 BC Minoans and Myceneans
753 BC Founding of Rome
476 AD Fall of the Roman Empire
1066 AD Norman Invasion of England
1215 AD Signing of the Magna Carta
11,000 BC
1300 AD
1000 AD
500 AD
0
1000 BC
5000 BC
Time
Time
Time
0100 100200 200300 300
BC/BCE AD
Centuries = 100 years
Time
0100 100200 200300 300
BC/BCE AD
Centuries = 100 years
First century BC Second century AD
Time
0100 100200 200300 300
BC/BCE AD
160 BC
Which century BC?
1st2nd3rd
160 BC = 2nd century BC
Time
0100 100200 200300 300
BC/BCE AD
280 AD
Which century AD?
1st 2nd 3rd
280 AD = 3rd century AD
Time
Rule for aligning dates to the correct century
Add 1 to the 100’s
number
160
+1
2
2nd century
280
+1
3
3rd century
2007
+1
21
21 century
1492
+1
15
15th century
Time
0100 100200 200300 300
BC/BCE AD
3rd century BC
Which years BC?
1st2nd3rd
3rd century BC = Years 200 - 299 BC
Time
Rule for aligning centuries with
the correct date
Subtract 1 from the 100’s and add
the years 0 through 99
Time
The Roman Empire fell in the fifth century AD.
The Magna Carta was signed in the thirteenth
century AD.
501
-1
4
400 to 499 years
1301
-1
12
1200 to 1299 years