Aurora Borealis in Astronomical Twilight

We lost night on April 8th but still have astronomical twilight until April 25th which looks like dark. Here are a few pictures from last night.
The last one is to show that the northern lights are still visible with a bright moon at this time of year. It is possible to see this phenomenon even in nautical twilight, so until May 15th if the effects are strong enough. 





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