90th meridian west - definition. What is 90th meridian west
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90th meridian west         
MERIDIAN
Longitude 90 degrees W; 90 degrees west
The meridian 90° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Gulf of Mexico, Central America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole.
Magnetic Meridian         
LINE BETWEEN THE EARTH'S POLES WITH THE SAME LONGITUDE
Lines of longitude; Line of longitude; Magnetic meridian; Meridian in geography; Geographic meridian; Geographical meridian; Circle of longitude; Standard meridian
A line formed on the earth's surface by the intersection therewith of a plane passing through the magnetic axis. It is a line determined by the direction of the compass needle. The meridians constantly change in direction and correspond in a general way to the geographical meridians.
Greenwich meridian         
THE MERIDIAN OF THE BRITISH ROYAL OBSERVATORY IN GREENWICH, ENGLAND, WHEN DISTINGUISHED FROM THE GENERAL CONCEPT OF A PRIME MERIDIAN
Greenwich Meridian Line; Greenwich Meridian; Greenwich meridian; Prime Meridian (Greenwich); Greenwich Prime Meridian; Nullmeridian; Airy meridian
¦ noun the meridian of zero longitude, passing through Greenwich.