What is History?What is History?

Webster: A chronological Webster: A chronological record of significant events record of significant events (as affecting a nation or (as affecting a nation or institution) usually of their institution) usually of their causescauses

What Is Time?What Is Time?

Webster: the measured Webster: the measured or measurable period or measurable period during which an action, during which an action, process, or condition process, or condition exists or continues.exists or continues.

How do we measure time?How do we measure time?

SecondsSeconds MinutesMinutes

HoursHours

January 1994

Sun Mon Tue Wed Thu Fri Sat

1

2 3 4 5 6 7 8

9 10 11 12 13 14 15

16 17 18 19 20 21 22

23 24 25 26 27 28 29

30 31

January 1994

Sun Mon Tue Wed Thu Fri Sat

1

2 3 4 5 6 7 8

9 10 11 12 13 14 15

16 17 18 19 20 21 22

23 24 25 26 27 28 29

30 31

How do we measure time?How do we measure time?

DaysDays

WeeksWeeks

YearsYears

CenturiesCenturies

DecadesDecades

MillenniumMillennium

CalendarsCalendarsAztec Calendar Stone

Michel Zabe/Art Resource, NY

Is our calendar the only calendar?

AztecCalendar

CalendarsCalendars

Today’s date is 5760!Today’s date is 5760! If you went by the Hebrew If you went by the Hebrew

calendar it would be.calendar it would be. It begins with the Creation, It begins with the Creation,

which is calculated to be 3,760 which is calculated to be 3,760 before the birth of Christ.before the birth of Christ.

CalendarsCalendarsToday is 1378!Today is 1378!It would be if you went It would be if you went

by the Islamic calendar.by the Islamic calendar.Theirs began with the Theirs began with the

year that Muhammad year that Muhammad fled from Mecca.fled from Mecca.

CalendarsCalendars Our calendar has its origin from the birth Our calendar has its origin from the birth

of Christ.of Christ. It was designated “AD” for It was designated “AD” for anno Domini, anno Domini,

“the year of the Lord.”“the year of the Lord.” The years before AD 1 were designated The years before AD 1 were designated

“BC” before Christ.“BC” before Christ.

The Gregorian Calendar:The Gregorian Calendar:Our CalendarOur Calendar

In 1582 Christopher Clavius introduced our In 1582 Christopher Clavius introduced our present calendarpresent calendar

It allowed for 365 days and a “leap year” every It allowed for 365 days and a “leap year” every year that is divisible by four.year that is divisible by four.

The Gregorian Calendar--The Gregorian Calendar--Our CalendarOur Calendar

Pope Gregory XIII devising a new calendar

Scala/Art Resource, NY

Pope Gregory XIII devising a new calendar

Scala/Art Resource, NY

Timelines: A Picture of TimeTimelines: A Picture of Time

A timeline is a chart that shows events in the A timeline is a chart that shows events in the flow of time, giving you a picture of how they flow of time, giving you a picture of how they relate to each other.relate to each other.

A timeline is a chart that shows events in the A timeline is a chart that shows events in the flow of time, giving you a picture of how they flow of time, giving you a picture of how they relate to each other.relate to each other.

•Divide into even divisions depending on the length of time shown.

2000199019801970196019501940

•Events are linked to the timeline by lines to the point precisely where they occurred.

Event 1 Event 2 Event 3 Event 4

September 11th TimelineSeptember 11th Timeline

8:00A.M.

9:00A.M.

10:00A.M.

11:00A.M.

12:00P.M.

1:00P.M.

2:00P.M.

3:00P.M.

4:00P.M.

5:00P.M.

6:00P.M.

7:00P.M.

8:00P.M.

9:00P.M.

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