Question

The greenwich time is called the greenwich mean time give reason

Answer 1

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Here is your answer,

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The Greenwich mean time is called Greenwich mean time because the prime meridian passes through Greenwich, a village near London.

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Answer 2

Answer:

Solution. The time of any place or country is calculated according to the 0° longitude or Greenwich meridian, the time change is of 4 minutes for every 0° longitude. So it is called Greenwich Mean Time.

Since the Earth is round, there needs to be a notational line where things begin and end, and the Prime Meridian is it for time. Your GMT is either plus or minus the time at the Prime Meridian. It's not hard to calculate your time relative to the GMT.