Which color is used for the navigation light on the left wing?

The navigation light on the left wing of an aircraft is designated to be red. This convention is established by aviation regulations that dictate the coloration of navigation lights for the purpose of ensuring safe operations and visibility during both day and night flights.

The red light indicates the left side of the aircraft, while the right side is illuminated by a green light. This color distinction enables other aircraft to easily recognize the orientation and direction of an airplane in the sky, which is critical for maintaining safe distances and avoiding collisions. The standardization of these colors helps pilots and air traffic controllers communicate effectively regarding the position and movement of aircraft in the vicinity.