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For many years I have been searching for information on the
probability of seeing the sun as it either hits or rises above the
horizon.

Whilst it seems incredible, as far as I can tell there is NO
INFORMATION ON THIS SUBJECT either specifically for any location or
generally for any particular location at any time of year.

All I have been able to ascertain is that in one location (Paisly
Scotland), the sun shines for roughly 30% of the day in summer and
around 15% in winter.

Unfortunately, I suspect the probability of seeing the sun is largely
determined only by the altitude of the sun, and as the sunrise/sunset
is always on the horizon, I suspect the probability of seeing the sun
does not change significantly from summer to winter in a maritime
climate like the UK.

As I have been unable to find any hard data on the subject, I really
could do with some "soft" information and those involved in navigation
although not necessarily having taken a reading at sunset/sunrise,
might be more aware of the sun shining and/or may have some records of
some form even if it is the number of days on which a siting may be
possible at a particular time.

PLEASE HELP!

Questions:-
1. Is sunrise/set more visible at sea?
2. Is navigation "visible"  related to meteological records of
"sunshine"?
3. How much does the probability of seeing the sunrise/set vary by
location (even in the same climate?) E.g. are there places that
irrespective of local geography have many more sights of sunrise/set?



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