slant visibility

slant visibility

[′slant ‚viz·ə′bil·əd·ē]

slant visibility

The visibility from air to ground as seen by aircraft while approaching the airfield. It may be more or less than the horizontal visibility as observed from the ground. In fog and mist, the airfield may be visible from directly overhead, but the level of the fog and the mist may preclude the sighting of the aerodrome when the aircraft aligns for landing.