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How do we find places on maps?. The earth has a grid system for locating the addresses of cities around the world. The “streets” running east-west are.

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Presentation on theme: "How do we find places on maps?. The earth has a grid system for locating the addresses of cities around the world. The “streets” running east-west are."— Presentation transcript:

1 How do we find places on maps?

2 The earth has a grid system for locating the addresses of cities around the world. The “streets” running east-west are called lines of latitude, or parallels, and the “streets” running north- south are called lines of longitude, or meridians. These are imaginary lines.

3  The Equator divides the Earth into the Northern Hemisphere and the Southern Hemisphere.

4  Latitude is defined as imaginary lines that run east to west above (or below) the equator.  The zero line for latitude is the equator which circles the earth midway between the poles.  The equator is at 0° and the poles are at 90°.

5  If the location point is north of the equator an N is added to the degrees.  If the point is to the south of the equator an S is added to the degree. 52°N 24°S

6  On the earth, lines of latitude are parallel lines.

7  The Prime Meridian divides the Earth into the Western Hemisphere and the Eastern Hemisphere.  Hemisphere is half of the earth, hemi meaning half and sphere meaning circle.

8  Longitude is defined as imaginary lines that run north to south  The zero line for longitude is the prime meridian which runs from the north pole to the south pole.  The Prime Meridian is at 0°.

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10  If the point is located to the west of the Prime Meridian we add a W to the value.  If the point is located east of the Prime Meridian we add an E after the value. 30°W 80°E

11  On the Earth, lines of longitude are called meridians.  The Prime Meridian has a value of 0° and no E or W. The longitude values increase up to 180° in both directions.  The International Date Line is opposite the prime meridian and has a value of 180° and no E or W.

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13 The Prime Meridian passes through the Royal Observatory in Greenwich, England. The International Date Line passes through the Pacific Ocean Note: Longitude lines ARE NOT parallel because they all run through the North and South Poles.

14  Latitude is written first and longitude is written last.  For example, the location of Honolulu, Hawaii on a map is 21 °N, 157° W  21°N is the coordinate representing LATITUDE.  157° W is the coordinate representing LONGITUDE

15 Tokyo, Japan Paris, France San Francisco, CA Sydney, Australia 35°N, 139°E 48°N, 2°E 37°N, 122°W 33°S, 151°E

16  Which imaginary lines run parallel?  Lines of Latitude

17  Which imaginary lines run through the North and South Poles?  Lines of Longitude

18  Which geography vocabulary word means “ half circle”?  hemishpere

19  What is the zero line for latitude?  equator

20  What is the zero line for longitude?  Prime Meridian

21  What degree is the International Date Line?  180°

22  If you place meridians 15° apart starting with the Prime Meridian, you will divide the Earth into 24 zones. These correspond to the 24 hours in a day.

23  As you travel around the world to the east, you gain an hour in time for each zone you cross. If you travel to the west you lose an hour.

24  If you traveled around the world to the east fast enough you would be a day older in a short time!  If you traveled west you could go back in the past!  To solve this problem it was agreed that the 180° meridian would signal the change of date point.  Travel east and the date goes back one day; travel west and you advance a day when crossing this meridian.

25  To keep all of a country in the same time zone, the International Date Line does not follow the 180° meridian exactly.  Other time zones make the same accommodations for country or state boundaries.

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