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This was done with film in the old days. You would sweep the slit across the film and then develop it.

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But there is something elegant in this new wrinkle, wouldn't you say? In the old days, the image of the sun was held stationary by a heliostat or whatever, while both the entrance and exit slits moved in parallel - one across the stationary image of the sun, the other across the stationary piece of film.

Here, the sun drifts, the camcorder records, and the software makes a picture out of the movie.

Gene

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