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Question
Give geographical reason:
The local time at Greenwich is considered to be the international standard time.
Solution
Local time is the time in a particular region or country. It is determined on the basis of the apparent movement of the sun. It is same for a region or country located on the same latitude. However, countries located in different longitudes have different local times. Thus, for an international coordination between countries, the local time at Greenwich (Greenwich Mean Time) in England is considered to be the international standard time. The standard times of various countries are calculated with reference to GMT by calculating the longitudinal difference.
For instance, if it is noon at Greenwich, the Indian standard time would be 5:30 PM
Longitudinal coordinates of Greenwich = 0
Longitudinal coordinates of India = 82°30’E
longitudinal difference = 82°30’E
Time taken to cover one longitudinal degree = 4 minutes
Standard time of India = GMT + (82.5) *4 minutes
= GMT + 330 minutes
= GMT + 5:30 hours
RELATED QUESTIONS
Give geographical reason:
The local time is decided by the noon time.
A football match being played at Sao Paulo, Brazil started in India at 6 am IST. Explain what would be the local time at Sao Paulo?
What is local time?
The Sun is overhead on a line of longitude ______in a day.
The word meridian is derived from the Latin word ______.
Examine the following statements:
- When you move towards the East from any meridian the time increases.
- When you move towards the West from any meridian the line decreases.
- The earth rotates from West to East on its own axis.
Look at the options given below and choose the correct answer.
What is GMT?
