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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
State with an example how time lost or gained is computed with reference to the International Date Line.
Calculate the location of a place where the local time is noon when it is 7.30 p.m. at Greenwich.
Which meridian is called Prime meridian?
What is “Greenwich Mean Time”?
How far is it correct to say that local time is the Sun time?
Give a reason for the following :
The distance between two consecutive meridians is equal to about 111 kilometers only at the equator.
Give a reason for the following :
All parallel other than equator are not Great Circles.
What adjustment has to be made when ships cross the International Date Line?
OR
Explain why a day appears to be lost in sailing round the world from east to west and gained when travelling from west to east.
(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’?
Fill in the blanks.
The Standard Meridian of India is ____________________.
