Question

Give geographical reason

2. the local time at Greenwich is considered to be the international standard time​

Answer 1

(1) The International standard time has been decided according to 0° longitude.

(2) 0° longitude passes through Greenwich, England.

(3) For an international co-ordination, it is essential to bring compatibility between the standard time of various countries in the world. For this purpose, the local time at Greenwich is considered to be the International standard time.

Answer 2

Answer:

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 time 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 p.m.

Longitudinal coordinates of Greenwich = 0

Longitudinal coordinates of India =82°30'E

longitudinal difference = 82°30'E

time taken to cover one longitudinal difference=4 minutes

Standard time of India =GMT +(82.5)*4 minutes

GMT + 330 MINUTES

GMT +5:30 hours

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