Turning my back on the Golden Gate Bridge, I photographed out the Golden Gate, past Kirby Cove, towards the open ocean. The star trails in this image form a short-long, the letter A in Morse code. You can see this better looking at the image larger.
I made two captures, the first at five minutes, and the second at eight minutes. The shorter star trails go with the shorter exposure, and the longer trails with the longer exposure. Stacking star trails is usually done with many exposures created using an interval timer, but I stacked with only two to see what would happen. I used the Maximum mode in Photoshop’s Statistics script to get the effect.
And they say the stars don’t speak.