scsvshsstclass5e(27.04)

LATITUDES AND LONGITUDES (PART 3)

 

April 27, 2020

Good Morning, boys!!

Hope you are completing all your written work and revising it too. Your work will be evaluated once we get back to school. Before we move ahead, let me test your previous knowledge.

Answer the following in the comment box:

The 0° longitude is known as ________

Line that marks the difference of date between the eastern and the western hemispheres.__________

Now let's move ahead!

At the end of the lesson, you will be able to

• locate places on the globe using latitudes and longitudes
• calculate the time at a place using longitudes

What kind of lines do you see on the globe?

Yes, the latitudes and longitudes which you see on a globe form a network. This network is known as a grid.

The grid helps us to accurately locate places on the maps and globes.

The point where the latitudes and longitudes cross each other, helps us to know the exact position of the place.

Click on the following link to understand how to locate a place on a map or a globe.

https://youtu.be/T1E0I4eLKNI

CALCULATING TIME

• Longitudes help in calculating time. 
• 
  
• The difference between two consecutive longitudes is of 4 minutes.
• When we travel eastwards from the Prime Meridian, we need to add 4 minutes on passing each meridian.
• When we travel westwards from the Prime Meridian, we need to subtract 4 minutes as we pass each meridian.
• The moment we cross to the east of the International Date Line, we gain or add a day.
• If we cross to the west of the International Date Line, we lose or subtract a day.

Let us understand this with the help of the following video:

https://youtu.be/wztjHgNX3gs

Now time for some written work.
Take out your S,St reader and notebook and write down these question answers:

C.W:

Q. Define grid.

Ans. A network of latitudes and longitudes is known as a grid.

Q. How do longitudes help in calculating time?

Ans.      

• The difference between two consecutive longitudes is of 4 minutes.
• When we travel eastwards from the Prime meridian, we need to add 4 minutes on passing each meridian.
• When we travel westwards from the Prime meridian, we need to subtract 4 minutes as we pass each meridian.
• The moment we cross to the east of the International Date Line, we gain or add a day.
• If we cross to the west of the International Date Line, we lose or subtract a day.

NOTE: Draw the above diagram on the blank side of your notebook.

So that's all for today! Stay safe..