Following yesterday's double moon, we were able to observe the rising moon between Worcester Park and Epsom yesterday evening at around 2300. Singular moon all the way to the back door. But viewed from the upstairs bedroom window, back on the doubles.
For these purposes my eyes were only inches from the window and the extra image could be moved around relative to the original by moving around - so I now think it must have been some reflection effect inside the double glazing. I suppose you have to have something bright like the full moon against a dark background to notice it.
Reference 1: http://psmv3.blogspot.co.uk/2016/06/two-moons.html.
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