Advertisements
Advertisements
Question
How is the longitude of a place determined?
Advertisements
Solution
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.
RELATED QUESTIONS
With reference to the International Date Line, state the following:
The important deviations it makes and reasons for the same.
Calculate the local time in Singapore (104°E) when it is 6.00 p.m. at Greenwich.
Calculate the location of a place where the local time is noon when it is 7.30 p.m. at Greenwich.
What is the “Prime Meridian”?
Give a reason for the following :
All parallel other than equator are not Great Circles.
What are the main characteristics of local time?
True or False.
The standard longitude for Indian time is the 64° longitude.
The network of lines of latitude and longitude.
What are called meridians of longitude?
What is known as Eastern Hemisphere?
