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9.21 Visibility

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In-Flight Visibility

The weather conditions at any time can have a dramatic effect on the visibility in flight. It can be either decreased or increased. On one hand, rain, snow, low clouds, fog or smoke can obscure a light to the point of invisibility, whilst on the other hand thermal gradients in the atmosphere create air pockets of different density which act as lenses, refracting the light and making it appear brighter than it actually is, sometimes even making it visible while it is below the horizon.