経度

1. Origins, structure, and basic meaning

• Structure: 経度 is read けいど and is a noun for the angular east-west coordinate of a location on Earth.
• Basic usage: It is used to locate islands or cities on a map and compare positions along the same north-south line.

2. Common pitfalls and similar expressions

• Distinguishing longitude from latitude
  • It gives east-west position, whereas 緯度 gives north-south position. The two coordinates are used together to identify a location.