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# Understanding Longitude and Latitudes

Lubna Naseem
40mins
Critical thinking, Problem Solving
Remember, Understand, Application
Yes
Objective 1: Students will learn to identify the difference between latitude and longitude

Objective 2: They will learn to find on a world map the location identified by a pair of map coordinates.

Objective 3: They learn the need why the world has been divided into these imaginary lines.
Underlying concept is to find out the answer to why the world was divided into these imaginary lines and how it helping us in navigating around the world in today's modern era
World Map

Step 1: Students need to be made aware of WHY Longitudes and Latitudes were invented in the first place. They are imaginary lines which divide the earth but why were they invented in the first place.
A short story behind this Longitude and Latitude can help students learn WHY they were needed in the first place.

Step 2: Explain what is the work of Latitude and then what is the function of Longitudes in travel.

Step3: How Harrison’s Clock gave the right answer-
After decades of diligence, and many design changes, he eventually produced his marine chronometer, H4, a spring-driven clock that could measure longitude to within the half-degree required for the £20 000 prize. Despite this, Harrison was initially awarded only half the promised amount.
On a voyage from England to Jamaica in 1761–62, H4 lost just five seconds in over two months at sea. It was now possible for a navigator to determine local time by measuring high noon, and compare this to the absolute time, which had been set on an accurate chronometer at the start of the voyage. With this information, he could then determine the number of degrees of longitude that he’d traversed during his journey.
At long last, both latitude and longitude could now be determined accurately, and for the first time you could say exactly where on Earth you were.
Today we measure by GPS-Today, it’s all done electronically through GPS, a world-wide radio navigation system made up of a constellation of 24 satellites and their ground stations. These ‘artificial stars’ are used as reference points to calculate a terrestrial position to within an accuracy of a few meters. In fact, with advanced forms of GPS you can make measurements to within a centimeter!
Step4: Once the reason for creating these lines has been explained then it becomes easy for the students to relate to the concept of position

Step 5: Give them small examples of how to locate a city and how they can read Latitude and longitude to identify the place.

Step 6: To make it better for their understanding a small exercise like the one given in resources can be used.

Where in the World
link-http://www.educationworld.com/a_lesson/dailylp/dailylp/pdfs/dailylp130.pdf
The best way to engage the students is ask them interesting questions in the beginning of the session like:
1. How do you think will you find your way back home?

2. How will you find your way if you have to travel from one city to another?

3. How will you find your way on sea? Where are you heading towards is right or wrong, how will confirm your position?

4. If the answer from the children is via GPS then ask them further question like- how did sailors navigate their way before GPS came into existence?
Accurate, Clearly explained, Complete, Knowledgeable, Precise, Well crafted/ articulated