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Sky Searching
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Lookout Training Handbook - Military training manual for keeping a lookout
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Night Lookout Techniques
Figure 6.—Sky searching. improvement  of  vision  in  dim  light  is  called  dark adaptation. Effective  dark  adaptation  must  be  planned  well  in advance. Exposure to excessive glare during the day will hamper the ability of the eyes to adapt to the dark at night. This effect may last for several days if the exposure has been severe; therefore, lookouts scheduled for night watches should wear sunglasses as much as possible in the daytime. Dark adaptation before going on watch consists of spending at least 30 minutes in darkness or with the eyes protected by red goggles. Wearing red goggles is effective because red light does not affect the eyes. To 13

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