Reading Latitude & Longitude

Lesson Plan - Get It!

Audio:

What are latitude and longitude?

The entire world is covered with invisible lines, called lines of latitude and longitude.

These invisible lines were invented thousands of years ago by ancient cultures. The lines were used to help people figure out where they were.

The lines that run up and down on a map are called lines of longitude.

You can remember that longitude lines go up and down because longitude starts with the word long. Since longitude lines go up and down, they appear to be longer.

Lines that run from side to side are called lines of latitude.

You can remember latitude lines go from side to side by remembering the phrase lat is fat. Latitude lines are like the belt of the earth, going around from side to side.

How do you read lines of longitude?

Longitude lines tell how far a place is located from east to west. They are spaced the farthest apart at the equator, and all the lines meet at the poles on the opposite ends of the earth:

Both lines of latitude and longitude are read using degrees (°). The 0° longitude line runs through Greenwich, England. This line is referred to as the prime meridian.

In both directions - east and west - the number of degrees grows. The farther away you get from Greenwich, England, the greater the longitude.

• Notice how the lines on both sides of 0° above say 10°?

10° to the left of the prime meridian is 10° W, and 10° to the right of the prime meridian is 10° E.

Lines of longitude go up to 180° in both directions. This is because if you add both halves together, you get 360°. 360° is always the distance around a circle or sphere.

To read longitude lines, put your finger on the location. Then, run your finger up or down to find the degrees longitude.

If the location is west of the prime meridian, make sure to say it is degrees west. If the location is east of the prime meridian, make sure to say it is degrees east.

Find Florence on the map below, which is located in Italy.

^{By Dodd, Mead & Company [Public domain], via Wikimedia Commons}

• What is the longitude of Florence?

You probably noticed that Florence does not line up exactly with one of the longitude lines. It is a little to the right of 10°. Therefore, we can estimate that Florence has a longitude of about 12° E.

How do you read lines of latitude?

Latitude tells us how far a place is located from north to south.

The 0° latitude line is the equator. The farther north or south you go, the greater the line of latitude.

To read latitude lines, put your finger on the location. Then, run your finger right or left to find the degrees latitude.

If the location is above the equator, make sure to say it is degrees north. If the location is below the equator, make sure to say it is degrees south.

Find Florence again on the map.

^{By Dodd, Mead & Company [Public domain], via Wikimedia Commons}

• What is the latitude of Florence?

Once again, Florence does not line up exactly with a line of latitude. Therefore, you can estimate Florence has a latitude of about 44° N.

Now, put the longitude and latitude of Florence together to find its exact location.

You should have said Florence’s exact location is about 44° N, 12° E.

Traditionally when writing latitude and longitude, the latitude is always written first. The numbers should be separated with a comma. When latitude and longitude are written together, they are called coordinates.

Now that you have learned a little about latitude and longitude, move on to the Got It? section to practice finding latitude and longitude.