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प्रश्न
How is the longitude of a place determined?
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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.
संबंधित प्रश्न
How many lines of longitude are there?
Why are letters E or W added to longitude values?
What is “Greenwich Mean Time”?
Give a reason for the following :
A person, travelling from Mumbai to London, alters the time on his watch at several places.
Clearly distinguish Longitude from Lines of Longitude.
“The degree of longitude decreases in length poleward”. Why?
(a) What is the rule of changing the date while crossing the international date line?
(b) What is meant by ‘six-day week’ and ‘eight-day week’?
Why is it 5.30 p.m in India when it is 12.00 noon in London?
Tick the correct answer.
The value of the prime meridian is
Geographically, what is the time difference between Dwarka in Gujarat and Dibrugarh in Assam?
