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karanlık

1. As used in aviation observations prior to 1 September 1956, descriptive of a cloud cover that is composed of predominantly threatening or unusually dark-colored clouds. It was denoted by the symbol “+” preceding the appropriate sky cover symbol. See thin. 2. For observing at night, a person needs two to three minutes to adapt to dark (dark adaptation) before a noninstrumental observation, e. G. , visibility at night.

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  • ebruau
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