Definition

A measure of angular distance from an arbitrary fixed point (or "prime meridian") on the earth's surface, which, since the 18th century, has been the meridian passing throught both poles and Greenwich, England. Longitude begins at 0 degrees at the prime meridian and increases as one moves west until it reaches 180 degrees west, it thereafter switches to an east designation and decreases until it reaches the prime meridian again.<br> <br> Longitude is measured in degress, which translate into nautical miles of a decreasing magnitude depending on distance from the Equator (or latitude), where a degree of longitude represents 60 nautical miles; at the poles a degree of longitude is reduced to zero distance. The longitude of New York City is approximately 74 degrees west.

Record ID: 115