Aircraft flies from 139º46.3’E to 180ºE/W: this is a change of longitude of 40º13.7’ to the East. The longitude indicated will change by the same amount in the same direction: i.e. from 139º46.3’W to 099º32.6’W
180º00’E/W
139º46.3’W 139º46.3’E
099º32.6’W
000ºE/W