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I also wondered whether for such a fine graze, the degree of eclipse may have appeared differently for widely spaced observing locations. However, I doubt whether changing your position here by a few thousand km would have much affect on the view of a sphere about 400,000 km away. But I could be wrong....
This also begs the question of just how sharp the transition from penumbra to umbra really is at ~400,000 km.
Chris
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