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In page Geographical mile:
"The Danish and German geographical mile (geografisk mil and geographische Meile or geographische Landmeile, respectively) is 4 minutes of arc, and was defined as approximately 7421.5 metres by the astronomer Ole Rømer of Denmark.[6] In Norway and Sweden, this 4-minute geographical mile was mainly used at sea (sjømil), up to the beginning of the 20th century.
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