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None of those definitions of "loom" that have been offered seems to accord
with my own understanding of the term, which occurs when you see the loom of
a lighthouse. The light itself is below the horizon, but what you can see is
the rotating beam swinging around and illuminationg low-cloud or haze in the
air above it.

Then, the loom is nothing to due with refraction, it's simply scattering of
some light from the brilliant beam into the observer's direction.

My experience, in UK waters, is that such a phenomenon is perfectly normal,
and indeed to be expected. Seldom does the light itself come into view
before it has been preceded by its loom. No doubt that's connected with our
famously-damp atmosphere.

George.

contact George Huxtable, at  george@hux.me.uk
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.


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