what will happen if a ship or an aeroplane crosses the 180 degree meridian from from west to east
If a ship or an aeroplane crosses the 180 degree meridian from from west to east, it will gain a day. For example, if the time in the ship is 12 noon on December 31 on the west of the 180 degree meridian, then the time will be 12 noon on January 1 as soon as the ship reaches east of that meridian.