Here's a tighter view of the rig in yesterday's shot – you can tell from the clouds behind the rig.
I usually try to capture at least three views of a scene: the overview, a vignette and a detail view. Yesterday's shot was the overview – a wide, all encompassing view, typically taken with a wide angle lens. Today's shot is the vignette. It has more detail on the main subject of yesterday's image – the rig on the horizon. You might also notice on the horizon to the right of the rig the lights of some vessel much further away. If you can't see it, click on the image to go to my SmugMug version and then click on the x2 or x3 image size.