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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
Give a reason for the following:
Lines of longitude are also called Meridians of longitude?
Give a reason for the following:
The Greenwich time is called Greenwich Mean Time.
With reference to the International Date Line, state the following:
The important deviations it makes and reasons for the same.
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.
State two properties of lines of longitude.
What do you mean by “Meridians or Lines of Longitude”?
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.
When it is 7.30 pm on August 16 in Greenwich, it is ______ (time) on ______ (date) in Chennai.
True or False.
The time at a place in the east of Greenwich is ahead of that in Greenwich.
How many times would the sun pass overhead a line of longitude?
