I was in San Francisco on a business trip. Actually, just north of it, at the near end of the bridge, staying in a resort right under the end called Cavallo Point.
I went out every night.
The fun thing is this another "move the moon" shot. The moon was actuslly 90 degrees around the horizon to the left, and much higher than the bridge.
Here's a tutorial. I didn't have a slit card, so I just made one by holding my hands slightly apart.
Some other shots from other nights that I considered entering:
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