I remember reading that a pilot can determine the direction of another aircraft from sight depending on which wing light is visable. (red or green)
Would someone remind me of how its worked out?
Aviation navigation lights
Aircraft navigation lights are placed in a way similar to that of marine vessels, with a red navigation light located on the left wingtip leading edge and a green light on the right wingtip leading edge. A white navigation light is as far aft as possible on the tail or each wing tip. High-intensity strobe lights are located on the aircraft to aid in collision avoidance.
Navigation lights in civil aviation are required to be operational and to be turned on from sunset to sunrise.
"Red, Right, Returning". If aircraft ahead has a red light on the right, he's coming at you.
Thanks for the explaination CRJCapt.