Definition
Conspicuous illuminated features at or near an airport — such as airport beacons, approach light systems, runway edge lights, lighted obstructions, or distinctive city lights — that a pilot can identify at night to determine flight visibility. At night, when daytime reference markers cannot be seen, flight visibility is judged by the greatest distance at which these prominent lighted objects can be clearly seen and recognized.
Plain English
Bright, easy-to-spot lights — like the rotating airport beacon, runway lights, or other strong lights near the field — that a pilot uses at night to estimate how far they can see.
Context Anchor
Seen in visibility discussions, especially when comparing daytime visibility references with nighttime visibility references.
Derivation
Prominent comes from a Latin word meaning “to stand out.” That helps here because the object must stand out from its surroundings enough for the pilot to see and recognize it.
Why Pilots Care
Used to judge whether visibility meets legal minimums for continuing an approach or landing at night.
Grounding Statement
If you can identify a known lighted tower several miles away at night, that tower is acting as a prominent lighted object for judging visibility.
Intuition Check
Do not read this as just any object that happens to have a light on it. In this context, it means a lighted object that is noticeable enough and recognizable enough to help judge visibility.
Example Sentence 1
On the night approach, the pilot used the airport beacon and runway edge lights as prominent lighted objects to confirm the reported three miles of visibility.
Example Sentence 2
At night the controller asked if prominent lighted objects remained visible before clearing the aircraft for the visual segment.