I'm wondering... has anyone achieved the same effect at lower latitudes by stitching together a year's worth of circumpolar photos, based on, for example, two hour exposures on the first of every month for a year? Sure beats spending a long day's night in Thule. One could even meet the "single-exposure" criteria for Lewin's Challenge by dedicating a camera for a year, forcing the diaphragm open for the whole year, exposing it to the stars for the twelve two-hour nights, and exposing it to the inside of a light-proof bag the rest of the time.
This challenge is something which has crossed my mind a number of times and I believe it is much easier than it may seem.
The suggestion above was my first possible solution to such an image and I believe it would require three
strategically selected and dedicated evenings. Let's not forget that winter is approximately twelve
hours in duration at its peak which solves one-half of our problem. The balance SHOULD
be doable around late spring and early fall.
For something like this to be really pulled off, an area with dark skies would be necessary and where a camera could be left in a permanent setting so that the three exposures I describe above could be pursued.
The more and more I think about this exercise, the more and more convinced I become to (finally) pursue it since fall is not too far away for one of the three desired evenings.