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uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged. |
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#11
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BlueLightning wrote:
I sure saw a glow in the northern sky last night. Around 2:30am, it was before dawn The sky looked almost electrically charged, but not moving or changing like northern lights. Don't normally see northern lights anyway, since i'm in south-west england I speculated it might have been high altitude clouds with the bright moon shining off There was a nice display of NLC at 2am with the northern horizon aglow. I think you are describing the same (51.5°N). |
#12
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Felly sgrifennodd Roger Smith :
Astronomical twilight does not end until the sun is 12 deg below the horizon, so at the summer solstice it lasts all night at latitudes north of 54.5 deg. Unless definitions have changed, I think that's a little confused. Civil twilight: 0-6 degrees below Marine twilight: 6-12 degrees below Astronomical twilight: 12-18 degrees below Even the Lizard peninsula experiences astronomical twilight all night at this time of year (by about 1.5 degrees). Gianna gets marine twilight all night (sun is about 9 degrees below) and shetland gets civil (terrestrial I think I read it as) twilight all night. When I lived between Aberdeen and Peterhead, I remember walking on Forvie Sands at midnight (local: i.e. about 1:08 am). A full moon was shining, but based on the shadow cast, the full moon was giving less light than the sun. Adrian -- Adrian Shaw ais@ Adran Cyfrifiadureg, Prifysgol Cymru, aber. Aberystwyth, Ceredigion, Cymru ac. http://users.aber.ac.uk/ais uk |
#13
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![]() "Adrian D. Shaw" wrote in message ... Felly sgrifennodd Roger Smith : Astronomical twilight does not end until the sun is 12 deg below the horizon, so at the summer solstice it lasts all night at latitudes north of 54.5 deg. Unless definitions have changed, I think that's a little confused. Civil twilight: 0-6 degrees below Marine twilight: 6-12 degrees below Astronomical twilight: 12-18 degrees below Even the Lizard peninsula experiences astronomical twilight all night at this time of year (by about 1.5 degrees). Gianna gets marine twilight all night (sun is about 9 degrees below) and shetland gets civil (terrestrial I think I read it as) twilight all night. When I lived between Aberdeen and Peterhead, I remember walking on Forvie Sands at midnight (local: i.e. about 1:08 am). A full moon was shining, but based on the shadow cast, the full moon was giving less light than the sun. Adrian -- Sorry Adrian, my mistake - carelessness, not ignorance. All of the UK (ie anywhere north of 48.5 deg) is afflicted by this phenomenon at this time of year. Regards, Roger |
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