The Globe How to describe where you are, and how to find new places.
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Transcript of The Globe How to describe where you are, and how to find new places.
![Page 1: The Globe How to describe where you are, and how to find new places.](https://reader030.fdocuments.in/reader030/viewer/2022032805/56649ee15503460f94bf1371/html5/thumbnails/1.jpg)
The Globe
How to describe where you are, and how to find new
places.
![Page 2: The Globe How to describe where you are, and how to find new places.](https://reader030.fdocuments.in/reader030/viewer/2022032805/56649ee15503460f94bf1371/html5/thumbnails/2.jpg)
Intelligence Competition
• To find who is smarter, males or females, we are going to conduct a scientific experiment. I will give the name of a place in Arizona. When you have located that place on the map, raise your hand. This is a timed test. The first 5 times will count for the team score. Lowest times win. Ladies first. No cheating!
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Ladies find -
• Sasabe Arizona
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Guys find -
• Holy Joe Peak
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HINT!!! Look in I 9
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You need - Coordinates (= two
numbers)• One set across• One set down• Start at logical point - on flat map,
upper left corner (just like reading.)
• Use letters or numbers• I 9 BINGO!
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Can we do this for the Earth?
(Photo of Earth here)
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We have a problem!
• Spheres don’t have a logical starting point.
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BUT, The Earth rotates on its axis.
North Pole
South Pole
This gives us Two logicalStarting points.
(How wouldYou know ifYou were There?)
Axis
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You could then draw lines from one pole to the
other.
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Now, if you divide each of those lines in half and
draw a line through the midpoints…
You get the Equator
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Next, draw lines around the Earth parallel to the equator.
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Finally, we have our grid!
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Remember from math -Circles are divided into 360 degrees.
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Latitude
• Measures degrees north/south– also called parallels
• Starting point: Equator 0º• Ending point: Poles 90°N,S• Equator separates
North/South Hemispheres• Equator is a great circle
– the only parallel great circle– What in the world is a GREAT
CIRCLE?
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A great circle is the edge of a cut through the Earth
that passes through Earth’s center
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Longitude
• Measures degrees east/west– also called meridians
• Starting point: Prime Meridian 0º
• Ending point: International Date Line 180º
• Separates East/West hemispheres– every meridian and the one
opposite make a great circle
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Each Degree of Latitude(or Longitude at the Equator)
• Represents ~69 miles• (360 x 69 = 24,840mi)
• To be more precise:– each degree
• 60 minutes • ~1.15 miles
– each minute • 60 seconds • ~101 feet
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Distance for a degree of longitude varies
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Written Form
latitude, longitude
degrees minutes (&seconds)
Phoenix: 33º 26’ N, 112º 04’ W
MCC: 33º 25’ N, 111º 49’ W
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International Meridian Conference
• 1884
• 27 nations
• Established Royal Observatory at Greenwich England as the Prime Meridian
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Map Projections
• A globe is not always the best representation of the Earth
– Doesn’t show local detail– Lacks convenience - not
portable
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Map Projections
• But a globe is the only true representation of:– direction– area– shape– distance