Meaning: the angular distance between a point on any meridian and the prime meridian at Greenwich
"WE ARE ON EARTHQUAKE ISLAND." He gave the longitude and latitude. "COME QUICKLY OR WE WILL BE ENGULFED IN THE SEA!
After touching the Tropic of Capricorn at longitude 135 degrees, it headed west-northwest, going back up the whole intertropical zone.
The doctor watched him with a smile; and, while Joe went on, he took the bearings, and found that the missionary's grave lay in twenty-two degrees twenty-three minutes east longitude, and four degrees fifty-five minutes north latitude.