John, Yes, NASA did use such a device on the moon - at least that's my understanding of how it worked. When I saw that item back in the '70s I wrote to N. Armstrong about it and he was kind enough to send me a response along with a small amount of info on the device. At the moment I can't find any of the details because, after seaching around in my files for the letter I finally found the note to myself that I have transferred it to my safe deposit box for safekeeping. If I get a chance to visit the bank in the next month or so, I'll recover it.
If you check with Woody Sullivan at the University of Washington ([EMAIL PROTECTED]), he might be able to tell you about possible plans for a somewhat more sophisticated sundial on an upcoming Mars mission. Fred Sawyer
