From late 80's probably. Can't recall if I put a 4 pt. star Cokin filter on the lens, and then quickly popped off the flash with a dark blue filter attached to it, or if I just put the star filter in front of the flash along with the blue filter. Probably a 6 to 8 hour exposure.
Couple of jets going through the frame, and I noticed that I climbed up on the railing in the dark to pop off some filtered flashes on the solar panels.
Kodachrome.