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# the globe hemisphere

To know specifically where something is located on Earth’s surface, a coordinated grid system (that is agreed to

internationally) is needed. The terms latitude and longitude were in use on maps as early as the first century A.D., with

the concepts themselves dating back to Eratosthenes and others.

Adapting from the Babylonians, Ptolemy divided the circle into 360 degrees (360°), with each degree subdivided into 60

minutes (60’), and each minute further subdivided into 60 seconds (60”). This method of dividing degrees into minutes

and seconds is often referred to as DMS coordinates. Note that GIS, GPS, and other computer-based systems often use

decimal degrees or DD coordinates. In this method, each degree is divided into a more familiar base ten system.

Figure 1 Latitude and parallels

1. What is the highest latitude?

2. What is the highest longitude?

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Figure 2 Longitude and meridians

3. List 3 countries that the Prime Meridian passes through.

4. When you look at the Prime Meridian on the globe, which hemisphere is located to the left of the Prime

Meridian?

5. Now locate the International Date Line on the globe. Which hemisphere is located to the left of the IDL?

6. Using a globe, find 30°S, 60°W. What country is located at these coordinates?

7. Starting from the same coordinates (30°S, 60°W), move your finger 20 degrees toward the north. List the

country closest to this location along with the latitude and longitude.

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