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Just remembered something I forgot to tell you:
Sometimes the constellations are hard to recognise in reverse.
You are looking at them but thinking "that's not it".
If this becomes a nuisance, remove the bottle cap and mirror assembly, make a hole in the bottle cap one third the diameter of the main tube and glue it back on.
In this way everything is in normal vision but you have to look through the end of it instead of the side.
Have fun.
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