A Grid on Our Earth, An Exploration on Map Grids

Maps, Then and Now

The first maps made of our earth weren’t very accurate at all.  They were mostly drawn from imagination.  The European maps from these medieval times are called mappae mundi (meaning “cloth of the world”) and they really weren’t intended to be used for finding your way around at all.  They were more like medieval encyclopedias that were used to illustrate stories, show directions, and tell about species of animals, other races of people, and plants from places near and far.  Mapmakers of their day really couldn’t have made the accurate maps we use today because we rely on satellite imagery that wasn’t available all those years ago.

Take a look at this mappa mundi.  It would’ve been used to teach stories rather than navigate.  Can you spot a story that’s familiar to you?

“MAPPA MUNDI in JEAN MANSEL La Fleur des Histoires. Valenciennes, 1459-1463, This image is in the public domain because its copyright has expired.

Our world maps today are incredibly accurate, except that we still have difficulty depicting a round earth on a flat piece of paper without skewing parts of it.  (Generally school children believe that Antarctica is a long, skinny continent, when it’s actually quite roundish.)  Satellite technology, computer graphics, and aerial photos give us a very clear picture of just what our maps should display.  With accurate maps and GPS systems built directly into our smartphones, it’s pretty easy for us to navigate around this globe of ours.

Map Grids

Even though we have GPS these days, it’s still important for kids to understand how our map grid system works.  Map grids are pretty simple; young kids can begin by just adding 2 of our imaginary grid lines – the equator and the prime meridian.  These are like the zero lines for the rest of our earth’s grid.

A Grid on our EarthUse this printable map of the world and glue a 1/8″ wide piece of ribbon to the equator.  We used purple ribbon for the equator.  Explain that if we were there standing on the equator, we wouldn’t see a line at all.  We have just put an imaginary line on our maps to represent the line that divides the globe in half, exactly the same distance from the north pole to the south pole.  You might want to talk about what else the kids know about the equator (like mine were quick to point out that it is warmer there because of the close proximity and directness of the sun to the equator).

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Next we added the prime meridian – a yellow ribbon.  The prime meridian is a line we use to divide the eastern hemisphere (half-globe) from the western hemisphere.  Again, just an imaginary line mapmakers use.

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Older students can also learn the other lines of latitude and longitude.  After the ribbon equator and prime meridian have been added, begin giving grid coordinates and have the kids highlight each of the given latitude and longitude lines and find the spot where they intersect with their finger.   We put a matching colored dot on our intersection points as well.  These are the coordinates we used:

 Orange line (20 degrees North, 80 degrees East)

Green line (40 degrees South, 140 degrees West)

Brown line (80 degrees North, 160 degrees East)

Red line (80 degrees South, 40 degrees East)

Blue line (60 degrees North, 80 degrees West)

*Latitude lines are always listed before longitude lines in coordinates.*

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Then I asked the kids to find the coordinate point that intersected closest to where we live and mark it with a pink star and then trace those lines in pink as well.  They were able to tell me our own coordinates where we live.

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Our maps turned out to be colorful and memorable learning tools.

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3 Responses to A Grid on Our Earth, An Exploration on Map Grids

  1. Thank you for the great ideas! I’m using these today with my kids in our study of Pirates, and I’ll be sharing on my blog, too.

  2. Pingback: Exploring Pirates in World History - NickiTruesdell.com

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