One of the spherical coordinates of a point on the Earth’s surface defined by the angular distance between the point and the prime meridian.
- Longitude is usually expressed in spherical degrees.
- All points on the same meridian have the same longitude.
The point P is located at 45° north latitude and 80° east longitude.
According to the ISO 6709 international standard from the International Organization for Standardization (ISO), the order of the elements is latitude, longitude and altitude.