Night Operations

Question 1

Autokinesis

Answer 1

• at night, a stationary light will appear to move if stared at for too long

Question 2

False Horizon

Answer 2

• sloping cloud formations, obscured horizons, or odd ground lights can create the illusion of not being aligned with the actual horizon

Question 3

Size-Distance Illusion

Answer 3

• a source of light that becomes brighter or dimmer may create the illusion of being closer or further

Question 4

Flicker Vertigo

Answer 4

• a flickering light during night may lead to nausea or vertigo

Question 5

Featureless Terrain

Answer 5

• known as “black hole effect”, lack of ground lighting or visual references can lead to illusion of being higher than actual

Question 6

Ground Lighting

Answer 6

• ground lighting along a highway or road can easily be mistaken for a runway