Besides getting to play in the fog, I wanted to mention an interesting article I came across at The Digital Photography School titled Beyond Sunset: The Different Phases of Twilight. I never realized that there are three different phases in twilight and they have names but the really neat thing the article shows is that there is still a lot more time to shoot some great shot even after the sun goes down (or before it comes up). Also there is an iPhone called SoLuna that will give you the exact times they happen at your location each day. The three phases of twilight are called Civil Twilight, Nautical Twilight and Astro Twilight. So I learned something new today!