Air-mass

From International Dictionary of Marine Aids to Navigation
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6-3-035

The length of path through the earth's atmosphere traversed by the direct solar beam, expressed as a multiple of the path traversed to a point at sea-level with the sun directly overhead.




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

second

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