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How many hours in a day?

How many time zones in the world?

Between each time zone is 1,000 miles or 15°

What is the circumference of the earth?

The Prime Meridian is located at at 0° longitude.

What is on the opposite side at 180° longitude?

The International Date Line separates one day from the next.

What year is it of my

reign?

Reign - marked time by

how long a king or

queen ruled

Methods of Telling Time

•Born: 276 BC in Cyrene (now Libya) •Died: 194 BC in Alexandria, Egypt

•He was the first person to use the word "geography" in Greek and came up with the system of latitude and longitude.•Dated events by Olympiads (for the 4 years between Olympic games). •There was no set system to count months or days – months were usually measured by the moon, and each city did it differently.

Eratosthenes

Every 4 years

• 6th Century monk who invented the term A.D. in A.D. 525.

•A.D. = Anno Domini (Latin for “in the year of the Lord”)

•He based the numbering system on the birth of Christ (not his death at the age of 33).

•Therefore, A.D. does NOT stand for “after death.”

Dionysius Exiguus

Dionysius Exiguus invented A.D.

based on events that occurred “in the

year of the Lord.”

What about events before the birth of

Christ?

B.C. A.D.

B.C. stands for… Before Christ

A.D.

Anno Domini

B.C.E.

Before Common Era

C.E.

Common Era

B.C.

Before Christ

B.C. and B.C.E. A.D. and C.E.

**B.C.E. and C.E. were created for those who didn’t want to measure time in a religious sense.**

Means… around or about (used when exact dates are

not known)

Abbreviations for circa are c. and ca.

Greek vase c. 375 B.C.

A period of 10 years

How many decades old are you?

How many decades old are your parents?

Sixties!

A period of 100 years.

How many years old is this tree?

In what year was Hill Country built?

In which century?

In what year were you born?

In which century?

**The first century started at zero, which is why the 1900s were the 20th C. and the 2000s are the 21st C.

A stretch of years from a set point in history.

My favorite era is the ____________ era!

(i.e. Cenozoic, Mesozoic, Paleozoic, Precambrian, Premodern, Modern, Postmodern, etc.)

Before the fall of Rome in A.D. 476

After the fall of Rome in A.D. 476

http://www.rennfest.com/orf/photos/98/p14.htm

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