Glossary
Longitude
Angle formed by the meridian of a given point, the centre of the Earth and the Greenwich meridian. The longitude of a point is calculated as the difference between local time at that point and the time at the Greenwich meridian. Measured from -180° to +180°, it is negative east of Greenwich and positive west of Greenwich. Longitude is an essential factor in air and sea navigation.
A point is described as being east (E) or west (W) of Greenwich.
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