Why does the plane turn on the light at night? Why did they turn on the light?

Its function is also to avoid air traffic accidents. Although the sky is vast, modern planes are very fast because there is still the danger of collision. In order to avoid air collision accidents, besides providing certain routes for civil aviation aircraft with regular flights, pilots must also pay attention to observing the situation before and after the air. In order to make it easier for pilots to observe whether there are planes around them at any time and to know the relevant situation of other planes with their own course, when flying at night, three navigation lights should be turned on on the left and right sides and the tail of the plane: from the pilot's position, the red light is always installed at the left wing tip, the green light is installed at the right wing tip and the white light is installed at the tail. The three light zones can be lit continuously or intermittently. It is convenient for the pilot to observe the situation after the night flight plane turns on the navigation light. If the pilot sees a plane at the same height as himself, and only sees two traffic lights, it means that the other side is coming face to face and is in danger of collision, so he must avoid it. If you only see a light, it means that the other person is on his left or right; If you can see three light areas at the same time, it means that the other party is flying above or below itself, and there is no danger in either case. Of course, in the case of high speed of modern aircraft, it is not perfect to rely solely on lighting instructions. What if the weather is bad, cloudy and foggy? Now there is a device called "aircraft approach indicator", which can help pilots find approaching aircraft. This kind of equipment is equipped with indicator lights, and at the same time, it constantly emits radio waves to the surrounding area through the radar on the plane. When other planes fly close, radar waves are reflected back, making the indicator light up. From different indicator lights, you can see the heading and approximate distance of the approaching plane.