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I think it is a multiple exposure, centered on the point in the sky where the moon was to reach the deepest part of the eclipse, with exposure set to the necessary level to show the eclipse to best effect, having the result of showing a time-lapse sequence of the event from pre-penumbra entry to post-penumbra exit (that sounds kind of dirty, doesn't it?).
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"To those of you who are wearing ties, I think my dad would appreciate it if you took them off." - Robert Moog
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