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Old 09-18-2013, 04:58 PM
 
Location: Rome
529 posts, read 554,252 times
Reputation: 543

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Quote:
Originally Posted by Mac15 View Post
I don't think they really get twilight in the South of England. It gets dark there in the summer at like 9pm. I know this because when I watch the news at 9 it is pitch dark, here the sun doesn't go down till 10:15 and it is still broad daylight to 11.

So there is a 2 hour difference between here getting dark and there getting dark.
Such inaccurate statements are truly irritating.

That's how things are on June 23rd:
London - sunset 21:22 - civil twilight ending at 22:09
Derry - sunset 22:13 - civil twilight ending at 23:11

So apparently there's roughly a one hour difference between NW Northern Ireland getting dark and London getting dark, but one must take into account a 30 minute offset in NW NI due to its longitude and....
this means the "2 hour difference" is in fact a "1/2 hour difference"...
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Old 09-18-2013, 05:04 PM
 
Location: North West Northern Ireland.
20,652 posts, read 23,831,822 times
Reputation: 3107
Well tell me why it is pitch dark in london at 10:30 when I watch the news and it is broad daylight here?

Yes there is an hour sunset difference but the difference to getting dark is two hours because as I stated they don't have the twilight like here. Heck it doesn't start to 11:20.
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Old 09-18-2013, 05:05 PM
 
Location: Leeds, UK
22,118 posts, read 29,520,360 times
Reputation: 8819
Quote:
Originally Posted by Mac15 View Post
It's much brighter than that here at midnight.
I suspect it is.. as you would expect as you progress northwards. Likewise, it is considerably brighter in the north of Scotland at midnight than anywhere else in the UK.
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Old 09-18-2013, 05:11 PM
 
Location: Bremerhaven, NW Germany
2,714 posts, read 3,037,385 times
Reputation: 934
Quote:
Originally Posted by Rozenn View Post


Are these noctulicent clouds?
Yes they are, they are actually quite common here during the midnight dawn (as we call those time of year here). But not so this year, i sighted to first ones as late as Mid July..
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Old 09-18-2013, 05:27 PM
 
Location: Paris
8,161 posts, read 8,711,947 times
Reputation: 3547
Nice! Here they're quite rare. Last time I saw them were during the Bastille day fireworks of July 14th 2009:
http://astrosurf.com/eternity/nlc/IM...mensionner.jpg


Didn't see any in Scotland, though given the almost permanent overcast conditions there in July 2012, it isn't really surprising.
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Old 09-18-2013, 06:50 PM
 
Location: Vernon, British Columbia
3,026 posts, read 3,633,310 times
Reputation: 2191
I'm at 50 degrees N, but the sun goes down at 6 pm because the stupid hills even in the height of summer. If I'm up on the plateau, it light stays until after 10 pm.
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Old 09-18-2013, 08:13 PM
 
Location: Seattle
1,244 posts, read 1,292,468 times
Reputation: 460
Quote:
Originally Posted by Kaleetan View Post
You need to be at the arctic circle or above.

I was north of Seattle, around the summer solstice, and it is dark at 4am there. (Yes, I said 4am. I know, because for the first few days of my vacation, my body was still two timezones ahead! )

I'll post some pics from my visit

(That was taken at 4:21)
No you don't need to be at the arctic circle. You need to be at the arctic circle to get permanent daylight.

I can't see anything in that picture. All I can see is your mother's butt and a very reflective window.

The picture looks like it was taken from a low height. You are either a dwarf or a child. I think the latter.
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Old 09-19-2013, 07:19 AM
 
Location: Finland
24,144 posts, read 24,735,183 times
Reputation: 11103
Quote:
Originally Posted by Siberian High View Post
No you don't need to be at the arctic circle. You need to be at the arctic circle to get permanent daylight.
This is actually not true. Due to the Earth's axial tilt and the eccentrity of the orbit, meaning that the aphelion is during the northern hemisphere summer, you actually don't have to be at the Arctic Circle to have a polar day, you can be 100 km south. The city of Kemi in Finland, some 110km south from the Arctic Circle gets 4 days with a polar day.
Northern hemisphere locations at the Arctic Circle gets only the polar day, but not the polar night for that same reason. Rovaniemi, at the circle gets 2h 14 min of daylight on winter solstice.
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Old 02-19-2014, 04:40 AM
 
4,658 posts, read 3,647,691 times
Reputation: 1344
It is like 66.5 - 18 = 48.5.
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Old 02-19-2014, 05:01 AM
 
Location: North West Northern Ireland.
20,652 posts, read 23,831,822 times
Reputation: 3107
I don't think you would see it so far south.

In Winnipeg it was pitch dark at night.
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