Time

How do we measure time?

When was 3,000,000 years ago?

What is a timeline?

Time

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

TimeGeological 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')

TimeAnno 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 or exhibit

•key events

•within a particular historical period,

•often consisting of illustrative visual material

•accompanied by written commentary,

•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

TimeRule 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 201 - 300 BC

TimeRule for aligning centuries with

the correct date

Subtract 1 from the 100’s and add the years 01 through 00

TimeThe Roman Empire fell in the fifth century AD.

The Magna Carta was signed in the thirteenth century AD.

501

-1

4

401 to 500 years

1301

-1

12

1201 to 1300 years

Time