On page 9 of this horologically interesting article, you can see a 44-exposure analemma. Now, I didn't know what an analemma is until I saw this, so let me explain that it's a multiple-exposure photo of the sun, which forms a figure-8 pattern in the sky.

This is interesting and I would like more information about the photographer and how the photograph was made. I assume that the pictures of the sun (the dots) were taken at a radically reduced exposure, so that the sky area received almost no exposure at all so that it came out correctly when the final 'correct' exposure was made. I wonder how this was achieved for the solstice trails, though. It seems the shutter must be left open for those. Would you use slide film or negative film? Does anyone have any more information on this fascinating photograph or how one might go about duplicating it in thought or in reality?