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Saint Petersburg, Russia (60 degress north), is famous for its "white nights", in midsummer there is no real night, only twilight, but it's one of southernmost cities which get this phenomenon. http://upload.wikimedia.org/wikipedi...0%BA%D0%B8.GIF
Technically, it doesnt. 60°33′43″ is the latitudinal border for at least having one permanent civil twilight night. The permanent nautical twlight border is at 54°33′43, and i've experienced plentiful of that. And while it isnt completly dark, it certainly isnt very bright either. From my standpoint, the true "white nights" starts around 62-63N. Northward of there "white nights" are truly white.
If I'm really tired, I can easily fall asleep even at midday. I noticed that darkness cause dark thoughts for me, so I probably would be glad to live in a location which doesn't get really dark in some months. On the other hand, I don't know how to deal with such short days in winter.
Zone which is signed by white letters: white nights (civil twilight), zone which is signed by blue letters: nautical twilight, zone which is signed by letters with color whose name I don't know: astronomical twilight.
Technically, it doesnt. 60°33′43″ is the latitudinal border for at least having one permanent civil twilight night. The permanent nautical twlight border is at 54°33′43, and i've experienced plentiful of that. And while it isnt completly dark, it certainly isnt very bright either. From my standpoint, the true "white nights" starts around 62-63N. Northward of there "white nights" are truly white.
Whenever I look at Stockholm webcams in the summer, it is certainly very bright at 1am, but less so when it is cloudy.
Whenever I look at Stockholm webcams in the summer, it is certainly very bright at 1am, but less so when it is cloudy.
It might seem bright trough the lens of the camera and above ground level, but on the ground between houses it's much darker, especially in poor-lit areas. Driving without headlights would be hazardous even on summer solstice.
I can clearly see a difference in midsummer nights between Helsinki and Oulu at 65N.
When I went to Scotland I noticed that nights weren't pitch dark from Leeds northwards. Here at 48°51' N, we stay in astronomical twilight all night long for about 20 days. If you aren't an astronomer, you won't notice it though. It's pitch black for hours. I'm thankful for that, I wouldn't want to live in a place with white nights.
This is at 11:30 pm, almost 2 hours and a half before the middle of the night, solar-wise:
Quote:
Originally Posted by The East Frisian
Here is a picture i took on 17th June 2012 just shortly before 2 a.m in the morning.
This was taken on 20 June this year, after midnight:
It will probably get a bit darker than that before it starts getting lighter again at around 2am. As you can see, it's really only the northern horizon that stays bright.
This was taken on the same day, same time, looking east:
Last edited by dunno what to put here; 09-18-2013 at 04:07 PM..
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! )
These are taken by my man VepaS on 22 June, 1 day after solstice, at 61N:
Timestamped at 00:53
01:16
01:31
02:43
03:54
04:07
06:59
So even if the sky is illuminated, it still is fairly dark on the ground, and I certainly wouldn't wander in the woods without artificial light even at summer solstice.
When it's cloudy, it looks darker, on solstice one day earlier at 02:31:
This was taken on 20 June this year, after midnight:
It will probably get a bit darker than that before it starts getting lighter again at around 2am. As you can see, it's really only the northern horizon that stays bright.
This was taken on the same day, same time, looking east:
It's much brighter than that here at midnight.
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