Answer. Since the earth rotates from west to east, the places east of Greenwich are ahead of Greenwich Mean Time and those to the west are behind it. All the places located on a particular meridian or a particular longitude have the same local time.
Why do places on different meridians have a different time?
Places on different meridians have a time difference because they have sunrise and sunset at different times. International Date Line: The longitude at 180 degrees from the Greenwich Time Line is known as International Date Line. It was designated in 1884.
Do all places on same meridian have same time?
Time at a given place depends on the longitude and not the latitude. Thus, all the places at the same meridian will have the same time.
How do parallels and meridians help us locate a place?
Some lines of reference are required to find out the exact locations of certain places on the Earth. These lines are latitudes and longitudes. A set of imaginary parallels of latitude and a set of meridians of longitude together make a grid system that helps to locate any specific place or area on the Earth.
What is the main difference between parallels and meridians?
| Parallels | Meridians |
|---|---|
| There are 180 parallels of latitudes apart from the Equator. | There are total 360 Meridians |
| All parallels are not of equal length | All meridians converge at the poles and are thus of equal length |
| Parallels don’t intersect. | All meridians intersect at two places; the North Pole and the South Pole. |
Why is the time difference between each meridian of longitude 4 minutes explain?
It is because there are 360° of longitudes. The Earth takes 24 hours to complete one rotation or to cover 360°of longitudes. This means that the Earth covers 15° of longitudes every hour. Thus, one degree of longitude takes 4 minutes (1 hour = 60 minutes, divided by 15° per hour = 4 minutes per longitude).
What is the connection between meridians and time?
There is a close relation between longitude and time. The Earth makes one complete rotation of 360 degrees in 24 hours. It passes through 15 degrees is one hour or one degree in four minutes. Thus there is a difference of 4 minutes of time for one degree of longitude.
How does the time of a place depend on its longitude?
The time of a place depends on the longitude of that place because longitude of a place specifies whether that place is in west or in east. And if it is in west, then to how much degree it is in west. Similarly if it is in east, then to how much degree in the east.
How do you find the difference in time between two longitudes?
The Earth takes 24 hours to complete one rotation or to cover 360° of longitudes. This means that the Earth covers 15° of longitudes every hour. One degree of longitude takes 4 minutes (1 hour = 60 minutes, divided by 15° per hour = 4 minutes per longitude).
Why do we have 6th class time?
Answer: We need a standard meridian for India because of the vast longitudinal extent of the mainland. Thus, there is a time lag of two hours from Gujarat to Arunachal Pradesh. Hence, time along the Standard Meridian of India passing through Mirzapur is taken as the Standard time for the whole country.
Why are latitudes parallel but not of the same size?
The lines of latitude are not all equal in length. It is because they are complete circles that remain equidistant from each other. Tthe lines of latitude vary in size from the longest at the equator to the smallest, which are just single points, at the North and South Poles.
What is the difference between the parallel of latitude and meridians of longitude?
Complete answer: Parallels of latitude are the circles which are parallels from the equator to the poles whereas the lines of reference running from the North Pole to the South Pole are called meridians of longitude.
Why are parallels and meridians important?
The combination of meridians of longitude and parallels of latitude establishes a framework or grid by means of which exact positions can be determined in reference to the prime meridian and the Equator: a point described as 40° N, 30° W, for example, is located 40° of arc north of the Equator and 30° of arc west of
What’s the difference between the meridians?
These lines, known as parallels and meridians, help us to figure out the exact dimension and direction of a location. Parallels run from east to west and never intersect with each other whereas meridians run from north to south and intersect at the north and south poles.
What are two important meridians?
Prime Meridian = Longitude 0o (Greenwich Meridian). 2. International Date Line (Longitude 180o).
Why is it 5.30 pm in India when it is 12.00 noon in London?
In London, the Greenwich Mean Time (GMT) is followed. The Indian Standard Meridian is located 821/2∘ east of the Prime Meridian. Thus the Indian Standard Time (IST) is 5 hours and 30 minutes ahead of GMT. That is why, when it is 12 noon in London, it is 5.30 P.M. in India.
What causes time difference between countries?
As the planet rotates, some places receive sunlight or darkness, resulting in day and night. As the Earth rotates into the sunlight, you’ll see the sunrise, whereas rotating out of the sunlight is where you see the sunset. The Earth’s rotation is the primary cause why countries follow different time zones.
What is the time difference for every 1 minute longitude difference?
4 seconds
The correct answer is 4 seconds. Longitude is usually measured in degrees, minutes, and seconds, and 4 seconds time differences occur for every 1-minute longitudinal difference. 15 minutes of longitude = 1 minute difference; 1 minute of longitude = 4 seconds difference.
What is the time difference between one degree of latitude?
One degree of latitude is divided into 60 minutes (‘). One minute of latitude equals one nautical mile , which is equal to 1.15 land miles (1.85 km). Each minute of latitude is further divided into 60 seconds (“).
How many meridians are in a time zone?
24 standard
The system consisted of 24 standard meridians of longitude 15 degrees apart from each other, beginning with the Prime Meridian through Greenwich, England. Each meridian is the center of each standard time zone.
Why is local time change with the changes of meridian of longitude?
The time changes at a rate of 4 minutes for each degree of longitude. As the degree of longitude increases, so does the length of time. The fact that the sun rises earlier in the east than in the west is owing to this difference.