Thanks for the explanation Buzz. I'm afraid I just can't keep up with new additions to my dictionary. I started my English lessons nearly 80 years ago and one word I learned was "Twilight". I think I'll stick with that. It sounds better anyway.
Pardon my ignorance but what on earth is a Bluehour?
Thanks for the comments. I just happened to be in the right place at the right time although it took a lot of shots to get just a few decent images on a cold and very windy December day. We get these sort of waves when strong winds have been blowing from the North or North East for a day or two. We had a really bad storm about a month ago which did a lot of damage but the very high tides all occurred in darkness so I got no shots.
The limit is shown as 100 entries and the number of entries as 99. I have just tried to enter a photograph of a genuine rowing boat and it has been refused. Why?
This must be the only subject that has come first in two separate challenges. My shot of the same lighthouse at Sunderland came first in the "Stormy Weather" challenge. a great shot!