Originally published in 2000
The official definition of nighttime is: the time between the end of evening civil twilight and the beginning of morning civil twilight.
Density altitude is the pressure altitude corrected for nonstandard temperature.
Pressure altitude is the altitude indicated when the barometric pressure scale is set to 29.92.
The danger of spatial disorientation during flight in poor visual conditions may be reduced by having faith in the instruments rather than taking a chance on the sensory organs.
The most effective way to use the eyes during night flight it to scan slowly to permit off-center viewing.
A pilot should make preparations to adapt his eyes for night flying by avoiding bright white lights at least 30 minutes before the flight.
VFR approaches to land at night should be accomplished the same as during daytime.
The definition of hypoxia is a state of oxygen deficiency in the body.
Rapid or extra deep breathing while using oxygen can cause a condition known as hyperventilation.
A pilot should be able to overcome the symptoms or avoid future occurrences of hyperventilation by slowing the breathing rate, breathing into a bag, or talking aloud.