経度(けいど)

Geography

• 東経(とうけい) (east longitude)
• 西経(せいけい) (west longitude)
• 経度(けいど)0度(ど) (0 degrees longitude - prime meridian)
• 本初(ほんしょ)子午線(しごせん) (prime meridian - Greenwich)

Pair word

• 緯度(いど) (latitude)

Common expressions

• 経度(けいど)と緯度(いど) (longitude and latitude)
• 経緯(けいい) (longitude and latitude - abbreviated form; also means 'circumstances')

History: The measurement of longitude was a significant challenge in navigation history. Japan adopted the international standard with the prime meridian at Greenwich in 1886.

Note: Japan spans from approximately 122°E to 154°E longitude.