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A list of lights is a publication describing lighthouses and other aids to maritime navigation. Most such lists are published by national hydrographic offices . Some nations, including the United Kingdom and the United States , publish lists that cover the whole world in many volumes.
The X Window System contains primitive building blocks, called Xt or "Intrinsics", but they are mostly only used by older toolkits such as: OLIT, Motif and Xaw.Most contemporary toolkits, such as GTK or Qt, bypass them and use Xlib or XCB directly.
Each light is designed so that it appears as either white or red, depending on the angle at which it is viewed. When the pilot is approaching the lights at the proper angle, meaning the pilot is on the glide slope, the first set of lights appears white and the second set appears red. When both sets appear white, the aircraft is too high, and ...
When the wave-off lights are lit, all other lamps are extinguished. The wave-off lights are operated manually by the LSO. Some (particularly later) optical landing systems include additional lamps: Cut lights – Green lamps used to signal different things based on where the approaching aircraft is in its approach. Named for its original use in ...
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Comparison of PAPI, VASI, and OLS meatball and datum lights (not to scale) The ratio of white to red lights seen is dependent on the angle of approach to the runway. Above the designated glide slope a pilot will see more white lights than red; below the ideal angle more red lights than white will be seen. At the optimum approach angle the ratio ...
Runway end lights – a pair of four lights on each side of the runway on precision instrument runways, these lights extend along the full width of the runway. These lights show green when viewed by approaching aircraft and red when seen from the runway. Runway edge lights – white elevated lights that run the length of the runway on either ...
Watercraft navigation lights must permit other vessels to determine the type and relative angle of a vessel, and thus decide if there is a danger of collision. In general, sailing vessels are required to carry a green light that shines from dead ahead to 2 points (22 + 1 ⁄ 2 °) abaft [note 1] the beam on the starboard side (the right side from the perspective of someone on board facing ...