What did Airy establish at Greenwich?
Prime meridian
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Answer
The Prime Meridian, established at Greenwich by Sir George Airy in 1851, serves as the global reference point for longitude measurement. It is defined as the zero degree longitude line and divides the Earth into the Eastern and Western Hemispheres. The Prime Meridian's significance lies in its role as the starting point for calculating time zones and determining the exact location of any point on Earth.
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