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Excellent. Your time scale is similar to mine. You should have emphasised the very few days a year that the First and Last Gleams are visible. It takes a very long time doing this research, that is why 'they' used the shadows once the Sun has risen above the murk. All the 'Prediction sites' that I have visited are built on a down hill slope, which gives great accuracy without long distances.
Something is not right. This message is just to keep things from messing up down the road