Les Crossan wrote:
That's a good shot of noctilucent cloud. I reported it from here on the
solstice.

Isn't it just twilight? A quick check on twilight times for Gianna's
area shows that nautical twilight or astronomical twilight doesn't
happen; only civil twilight (sun up to 6 degrees below the horizon). You
can normally get by without artificial illumination during civil
twilight. By my reckoning for Gianna, the sun set's just after 10pm and
civil twilight happens about an hour and 10 minutes later. For higher
latitudes (such as Shetland), the sun won't set until 10:40pm and civil
twilight won't happen until nearly 0:30am.

--
Jonathan Stott
Canterbury Weather: http://www.canterburyweather.co.uk/
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