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meridian British & World English

A circle of constant longitude passing through a given place on the earth’s surface and the terrestrial poles

Meridian British & World English

A city in southwestern Idaho, west of Boise; population 66,916 (est. 2008)

meridian circle British & World English

A telescope mounted so as to move only on a North-South line, for observing the transit of celestial objects across the meridian

prime meridian British & World English

A planet’s meridian adopted as the zero of longitude

Greenwich meridian British & World English

The prime meridian, which passes through the Royal Observatory at Greenwich in London. It was adopted internationally as the zero of longitude in 1884