1. A marker used to tell where an object is located.
Reference Points
A marker used to tell where an object is located.

2. Equator
An imaginary line that circles the Earth halfway between the North and South Poles

3. Latitude
Horizontal lines that circle the earth running east to west and measure North or South of the equator

4. Prime Meridian
Imaginary line that divides the Eastern and Western Hemispheres.
The Prime Meridian runs through Greenwich, England.

5. Longitude
Vertical lines that run the same direction as the Prime Meridian and measure distance East or West of the Prime Meridian.

6. International Date Line
The line directly opposite of the Prime Meridian. It separates one calendar day to the next. Located in the Pacific Ocean at approximately 180 degrees.

7. Tropic of Cancer
Imaginary line of latitude that lies degrees North

8. Tropic of Capricorn
Imaginary line of latitude that lies degrees South.

9. Arctic Circle
Imaginary line located at degrees North

10. Antarctic Circle
Imaginary line located at degrees South