I have been trying to take the perfect sunset picture.

I use The Photographer's Ephemeris to work out in advance where the sun is going to set, in order to be in the right place at the right time when the sun goes down. The screen capture below shows a day when the sun would be setting behind Arran as viewed from the carpark at Portencross.

From the North of Largs, I lined up to get the sun going down behind a clump of trees on Bute:

And from the South of Largs, I waited for the sun to going down behind some trees on Great Cumbrae:

It doesn't always work. I got up early for a moonset behind the mountains of Arran but the dawn made the sky too light:

And I spend a cold, blustery evening on the exposed beach just beyond the ferry terminal at Saltcoats, waiting for the sun to set behind the tower on Norse Island but whilst I got a spectacular sunset, the sun went down behind cloud leaving just dull grey as the background for the tower...