The definition of longitude is the distance on the Earth's surface between a specific point and the prime meridian in Greenwich England, measured as a degree or the difference in time from the prime meridian.
An example of longitude is that New York City is at 74° degrees west and local time is 5 hours less than Greenwich mean time.
- distance east or west on the earth's surface, measured as an arc of the equator (in degrees up to 180° or by the difference in time) between the meridian passing through a particular place and a standard or prime meridian, usually the one passing through Greenwich, England
- Astron. see celestial longitude
Origin of longitudeMiddle English from Classical Latin longitudo from longus, long
- Angular distance on the earth's surface, measured east or west from the Prime Meridian at Greenwich, England, to the meridian passing through a position, expressed in degrees (or hours), minutes, and seconds.
- Celestial longitude.
Origin of longitudeMiddle English length, a measured length from Old French from Latin longitūdō longitūdin- from longus long ; see del-1 in Indo-European roots.