Dark skies

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Umpteenth Snark

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Message 1712856 - Posted: 14 Aug 2015, 14:55:51 UTC

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Profile Gordon Lowe
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Message 1713346 - Posted: 15 Aug 2015, 11:56:35 UTC

That's an incredible part of the world I'd love to visit.

I was just looking at the distance between Elqui Valley and Cerro Paranal, and it's an 8 hour drive.

Seems like the ocean would cause some problems with reflective light.
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Profile Bob DeWoody
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Message 1713368 - Posted: 15 Aug 2015, 13:26:09 UTC

From my limited experience on the ocean, the Atlantic off the coast of Florida, you only have to be a few miles off shore to get a fantastic view of the stars when the sky is clear.
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Message 1714348 - Posted: 17 Aug 2015, 9:56:25 UTC

I'd really like to visit it someday... ;)

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Message 1714446 - Posted: 17 Aug 2015, 13:45:21 UTC
Last modified: 17 Aug 2015, 13:50:50 UTC

Light pollution indeed spoils a lot from people. I once used to live in an outlying suburb, and sometimes late in the night, when they had shut off street lights, it was magnificent to walk home right under the Milky Way.

And how much wasted energy there must be in all that illumination going where nobody needs it?

Edit: the concept of light pollution surely is generally known, but just one insight: http://ngm.nationalgeographic.com/2008/11/light-pollution/klinkenborg-text/1.
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Message 1714488 - Posted: 17 Aug 2015, 15:16:44 UTC - in response to Message 1714446.  

Light pollution indeed spoils a lot from people. I once used to live in an outlying suburb, and sometimes late in the night, when they had shut off street lights, it was magnificent to walk home right under the Milky Way.

And how much wasted energy there must be in all that illumination going where nobody needs it?

Edit: the concept of light pollution surely is generally known, but just one insight: http://ngm.nationalgeographic.com/2008/11/light-pollution/klinkenborg-text/1.



That was a nice article, but
In the south Atlantic the glow from a single fishing fleet—squid fishermen luring their prey with metal halide lamps—can be seen from space, burning brighter, in fact, than Buenos Aires or Rio de Janeiro.
- I find that hard to believe.
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Message 1714545 - Posted: 17 Aug 2015, 17:12:46 UTC - in response to Message 1714488.  
Last modified: 17 Aug 2015, 17:32:17 UTC

In the south Atlantic the glow from a single fishing fleet—squid fishermen luring their prey with metal halide lamps—can be seen from space, burning brighter, in fact, than Buenos Aires or Rio de Janeiro.
- I find that hard to believe.

Yes, a surprising statement indeed. But maybe not incorrect, if we can trust this source: http://www.lightpollutionmap.info/#zoom=6&lat=-6344421.45217&lon=-6749012.93195&layers=B0TFFFFTT. I spotted this link north of Falklands or Malvinas, and you may want to compare further on the coastline.

As it seems to me, the very large city centres are... well, larger..., but the maximum radiance pollution level of the fishing fleets is within same scale. Which makes me also wonder, if I ever realised before how large-scale the squid or other fishing actually is.

And, can you see the Milky Way from your location?

Edit: Practised a bit with zoom, latitude and longitude, and you may try this, too: http://www.lightpollutionmap.info/#zoom=3&lat=-4000000&lon=-5000000&layers=B0TFFFFTT. The fishing fleets remain N or NW of Falklands or Malvinas.
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Message 1714618 - Posted: 17 Aug 2015, 18:37:29 UTC

Best dark sky I've seen in England is around Keilder Forest.

And as others have said, seeing the sky from the edge of civilization (or even beyond) takes some beating.
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Profile Gordon Lowe
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Message 1715316 - Posted: 19 Aug 2015, 14:31:20 UTC - in response to Message 1714545.  

As it seems to me, the very large city centres are... well, larger..., but the maximum radiance pollution level of the fishing fleets is within same scale. Which makes me also wonder, if I ever realised before how large-scale the squid or other fishing actually is.




I guess the concentration of the light in the middle of nowhere on the ocean is what causes them to stand out.


And, can you see the Milky Way from your location?



No, I've never seen it at all, anywhere, but the best I can see in Louisville is the Big and Little Dippers and the Belt of Orion.
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Profile Gary CharpentierCrowdfunding Project Donor
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Message 1715462 - Posted: 19 Aug 2015, 19:18:45 UTC - in response to Message 1714545.  

Interesting. Scroll that map over between Australia and Antarctica for some interesting activity.
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Tom Mazanec

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Message 1716051 - Posted: 20 Aug 2015, 19:10:19 UTC

The closest thing to a transcendent religious experience I ever had was at night one August, while on a rowboat in a lake in Canada. I could see the Milky Way from horizon to horizon. The stars looked 3D instead of 2D (yeah, yeah, I know it was an optical illusion, but still...).
HOWEVER there was an edging of light on part of the horizon where Toronto (IIRC) was located, and a bubble of light where Kingston was.
Light pollution travels far.
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Message 1716269 - Posted: 21 Aug 2015, 1:49:08 UTC

This all makes me want to go to the planetarium again, soon. That's the darkest "sky" I've ever seen. ;~)
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Message 1717504 - Posted: 23 Aug 2015, 20:40:12 UTC

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Message boards : Science (non-SETI) : Dark skies


 
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