Position lights are required to be displayed on all aircraft in flight during what time period?

Position lights, also known as navigation lights, are essential for maintaining safety in aviation by ensuring that one aircraft can see another in flight. The requirement for these lights to be displayed is specifically related to visibility conditions. They must be illuminated from sunset to sunrise, which encompasses the times when natural light is insufficient for aircraft to safely navigate and avoid potential collisions with other aircraft.

During daylight hours, the necessity for these lights is generally reduced due to the visibility provided by sunlight, allowing pilots to see other aircraft without the aid of artificial lights. While flying over water or when the aircraft is in motion could justify the use of position lights for visibility, these factors do not establish a regulatory requirement like the one in effect from sunset to sunrise.