Occultation

From International Dictionary of Marine Aids to Navigation
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2-5-140

A relatively brief interval of darkness, in comparison with the longest interval of light in the same character. (Fig. 42a)

Ch2 Fig42.jpg




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM