NCERT Class 6 Geography Chapter 2: Globe-Latitudes & Longitudes Complete Notes Part 6

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Globe - Latitudes & Longitudes

How can we do that?

As you move east you are adding. It would be 5pm,6pm,7pm,8pm,9pm,10pm,11pm,12(noon). Then 12(noon) that would be shifting in the day. So if it is 4th June at 4pm and then 12(noon) that would be shifting a day, so 5th June at 12(midnight), and that again 12(midnight), 1am, 2am, 3am, 4am, 5am, 6am so it would be here. So if the time is 4pm at degree west and would be comes 6am at degree east. So that a very kind of simple calculation is here.

Image of Time Zone example 3

Image of Time Zone Example 3

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I include the flight time suppose the I am boarding flight from degree west at same location and at the same time 4pm. My flight duration is 6 hours, at what time I will reach degree that a London or the Greenwich meridian.

How do I calculate that?

I am stating at 4pm, my flight time is 6 hours that means that 6 hours lost in air, so you would have a starting point as 10 pm. Now when I move till degree what would be the time? It would be a 10pm, 11pm, 12 midnight then 1am, 2am, 3am, 4am, 5am, and 6am. So I will reach degree London at 6 pm. So if I am boarding today I will reach tomorrow at 6 am. So that is one concept you need understand.

Image of Time Zone example 4

Image of Time Zone Example 4

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Now that next important concept is a concept of date line. When we talk about date line is important to understand how we move around the date line. So when we move around to west of date line and to the east of date line there is a difference. So let’s say I start at degree west and you have 5 pm so you have degree, 5 pm is local time here and that date is same 8 august. Now what would happen? Now let’s calculate what would happen, we cross to east to west and then will see what would happen when we cross west to east. Now this is International Date Line. And again the same international date line. We are drawing to in different location and then we will see how it’s works around crossing the International Date Line.

Now when I am crossing the date line, I am starting with 5 pm, it becomes 4pm I am going back so as I moving west I’m losing time. So you have 5pm, 4pm, 3pm, 2pm, 1pm and 12 noon. So degree date line at 12 noon. I try to understand as I said we are taking this as between degree east and degree west. And those all region would be degree and 0 (Zero) time zone, then what would have been next time which would start from here to here would be +1.

So here again this point it would be 12 noon. And seen day here is 8th august and what would happen. Soon as I cross this half of the section here, it would be 12 noon. As soon as I cross it become 9th august so you would have day that added as I move there. Because let’s move this way, then you will understand why we are adjusting a day, why this is important to adjust the day at the International Date Line.

Now same example let’s go east. So I have 5pm, 6pm, 7pm, 8pm, 9pm, 10pm, 11pm and 12 midnight. At 12 midnight we automatically change the day. So 8th august here would become 9th august. Now want I have 9th august. This region was 9th of august is a 12 midnight. Now I’m going further east. So it would be adding few mores so, 1am, 2am, 3am, 4am, 5am, 6am, 7am, 8am, 9am, 10am, 11am and 12noon. Now this 12noon till the point I reach here. It would be 9th of august of 12th noon but as soon as I say cross the international date line towards east, I loss a day that means beyond degree east it becomes 8th of august and that is true.

See I’m taking about globe. Now develop perspective of on the globe with self. So you have degree. Let’s see this is degree and this is degree. I’m starting from the back. Which 5pm and I am trying to go east so it’s degree west which is here and I am trying to cross date line towards the east. This 8th of august I reach the meridian and make it 9th of August and as soon as I reach on other the side when I cross it would be 8th of august. Therefore, I maintain common date on the globe. Otherwise there would be no end to the expansion of the day. So in simple terms I can say half of the 8th of august and half of the 9th of august.

Image shows 12 Time Zones of France

Image Shows 12 Time Zones of France

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Now the next thing is very important as the time zone. That is spread across the country now if we just about mainland Russia has maximum number of time zone with 11 time zones. However if we talk about the mainland and territories French would top the list and French has 12th time zone. Because of territories that are spread throughout the world. So you have main French is UTC-1 then the territory of the French and southern and Antarctic land and then towards the Mali nation island group so all this together has total 12 time zones. However if we talk about the mainland the maximum number of time zones are in Russia - 11 time zone.

Now there is another most important concept to understand that is latitude, longitude, time zone and Daylight saving Time.