Yn erthygl , sgrifennodd
Jack Harrison :
My four surface observations of green flash have been:
Sunrise near Aberdeen when a distant hill provided the clear horizon (in
fact, slightly tilted due to slope of hill)
Sunrise over the sea at Aberdeen.
Sunset over distant hill in Cornwall.
Sunset over distant mountain in Norway.

Jack,

I note that for only one of these was the sea the horizon, although
the sea would have been not far beyond the hill/mountain in the other
three cases (presumably). I have been told that it is more unlikely to
see the green flash with a land horizon. In your experience, then,
this presumably is not true - or did the sea beyond these hills play
a factor?

I've looked for the green flash from our mountains, with the sea some 12
miles or so to the west (unobscured if I climb a little way up), but not
seen it yet.

Adrian (12 miles ESE Aberystwyth, 260m/860ft asl)

--
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Adrian Shaw, Adran Cyfrifiadureg, Prifysgol Cymru, aber.
Aberystwyth, Ceredigion, Cymru ac.
http://users.aber.ac.uk/ais uk

"Adrian D. Shaw"
I have been told that it is more unlikely to
see the green flash with a land horizon. In your experience, then,
this presumably is not true - or did the sea beyond these hills play
a factor?

Not really. When above cloud, it doesn't matter how near or far you are
from the sea. I suppose the comments about land horizon being less suitable
its that there are often other features such as trees to spoil the
sharpness - I don't think many trees grow in the sea!

Jack