Your shutter is going to be open for a number of seconds and, by now, this probably goes without saying, but you’re going to need a tripod and a cable release (or wireless shutter release) to hold your camera perfectly steady while that shutter is open. The reason I’m having to repeat this is because you might be interested in shooting the sky, and maybe you turned right to this chapter and missed it earlier, so . . . ya know (this is the stuff you have to think about when you’re writing a book, and believe me, authors hate to repeat stuff, but sometimes ya gotta).