…a circle of constant longitude passing through a given place on the earth’s surface and the terrestrial poles…
…a city in southwestern Idaho, west of Boise; population 66,916 (est. 2008)…
…a telescope mounted so as to move only on a North-South line, for observing the transit of celestial objects across the meridian…
…the prime meridian, which passes through the Royal Observatory at Greenwich in London. It was adopted internationally as the zero of longitude in 1884…
