east longitude

基本解释

The epicenter of the quake was located 31.0 degrees north latitude and 103.4 degrees east longitude, the bureau said.
該侷還說，震中位於北緯三十一度，東經一百零三點四度。
Center point coordinates are located at 17 degrees, 5 minutes east longitude and 5 degrees, 0 minutes north latitude.
中心點素坐標位於東經17度5分，北緯5度0分。
The epicenter was monitored at 22.5 degrees north latitude and 113.9 degrees east longitude, with a depth of about 23 kilometers, said the station.
地震侷稱，據監測，震源位於北緯22.5度，東經113.9度，深度達23公裡。

So each hour's time difference between the ship and the starting point marks a ship's progress of fifteen degrees of longitude to the east or west.