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| Distance on a Globe
How far is it from Chicago, Illinois, to Moscow, Russia? The
answer to this depends upon how far you travel to get there.
Most long trips are now by airplane. While you might have to
vary your route, most air travel moves in straight lines.
In this lesson we are interested in line straight-line
distances. We will study the shortest distances between places
and measure that distance in miles. Your globe and globe
mounting can help us measure distance.
Below is a picture of a part of the scale that appears on the
Horizon Ring Mounting. Look at your Horizon Ring globe
mounting. The inner ring is yellow and shows miles. The red
line is the starting point for this mileage scale. It is
divided into 1,000 mile sections. Each section is further
divided by 100-mile marks. There is a darker mark at 500 miles.
The total amount of miles is shown in the lower right corner of
each 1,000-mile section.
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| This is called a graphic scale. You will use this graphic
scale as you measure the straight-line distance between two
locations on the globe. The example used to get started is to
find the great circle route between Chicago and Moscow.
Circle Chicago, Illinois, and Moscow, Russia. Place one of
your thumbs on Chicago and the other on Moscow. With your
thumbs in this position, rotate the globe until both thumbs
touch the Horizon Ring. Take your thumbs away. Be sure the two
cities line up with the ring. This is called the great circle
route. |
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Lesson 2 - Distance (continued)
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Measuring the Distance
Turn the globe so Chicago is exactly over the red line on the Horizon
Ring. Rotate the globe until the line is exactly along the Horizon
Ring. Read the miles from the red line, around to your right until you
reach the point where Moscow is located. Your answer should be about
5,000 miles. This is the approximate distance if you travel a straight
line. Any figure between 4,800 and 5,200 is acceptable.
Using this method, find the distance between the following pairs of
cities:
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| 1. San Francisco, California to New York, New York |
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| 2. New York, New York to Honolulu, Hawaii |
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| 3. Denver, Colorado to London, United Kingdom |
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| 4. Seattle, Washington to Tokyo, Japan |
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| 5. Chicago, Illinois to New Delhi, India |
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