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प्रश्न
How is the longitude of a place determined?
उत्तर
The Longitude of a place can be determined by comparing its Local Time with Greenwich Time. Greenwich Time can be known either by radio or by means of a watch which keeps Greenwich Time. Captains of ships generally use a Chronometer for this purpose. A Chronometer is a timepiece which keeps accurate time and is not affected by a change in temperature. Now suppose that when it is 2 p.m. at Greenwich, another place shows 5 p.m. The difference between the times of the two places is 3 hours, which is 180 minutes. Thus the place is =180 / 4 = 45° away from the Prime Meridian and since its time is ahead of Greenwich. Its longitude will be 45° East.
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संबंधित प्रश्न
Which line of longitude is used to fix the World Standard Time? State its value in degrees.
With reference to the International Date Line, state the following:
Give an example of how time lost or gained is computed with reference to this line.
Calculate the time at Durban (longitude 30°E) when the time is 7.00 a.m. at New York (75°W).
Calculate the location of a place where the local time is noon when it is 7.30 p.m. at Greenwich.
Why do some countries have many time zones?
OR
What are ‘Time Zones’?
What do you mean by local time?
True or False.
The standard longitude for Indian time is the 64° longitude.
A particular city lies in the time zone -2. What does this mean?
The imaginary lines drawn vertically on Earth.
India is located in this hemisphere based on lines of longitude.
