To have changed your longitude extensively and placed yourselves in a moral solitude in order to have small explosions, to find conversation difficult and to hand a glass of water without looking, can hardly be regarded as satisfactory fulfilment even to the toughest minds.
There are no more uses of "longitude" in the book.
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They’re allowed to catch the fish east of the 175th degree of longitude.
Just put the latitude and longitude into the navigation system and it will tell us how to get there.