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Nautical twilight calculator
as the time in the morning and evening when the centre of the Sun is 12° below the horizon. At high latitudes ... , the Sun will not be lower than 12° below the horizon for a period in summer, and will not rise above 12 ... and evening when the centre of the Sun is 12° below the horizon. At high latitudes, the Sun ... will not be lower than 12° below the horizon for a period in summer, and will not rise above 12° below ...
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Vessel tagging procedures survey
Description / Abstract: At the request of the Scientific Committee (SC-CAMLR-38; paragraph 4.12 ... At the request of the Scientific Committee (SC-CAMLR-38; paragraph 4.12), this survey ...
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