Question

what do you mean by green wich​

Answer 1

A borough in SE London, England: located on the prime meridian from which geographic longitude is measured; formerly the site of the Royal Greenwich Observatory.

Answer 2

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Greenwich. ( ˈɡrɪnɪdʒ; -ɪtʃ; ˈɡrɛn-) n. (Placename) a Greater London borough on the Thames: site of a Royal Naval College (now used as the National Maritime Museum),