Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

What are the mysterious light sources on light pollution maps?

altairspace.com

Post reply on HN
Print view View original

101–110 of 146 posts

Re: What are the mysterious light sources on light pollution maps?

#101

Post by bjelkeman-again »

leoh wrote: post #71
amatecha wrote: post #8

Ah yeah, in the post's first "unknown light pollution" example, I figured it must be a greenhouse. I was driving through a relatively small town one time and was a bit freaked out by this ominous yellow glow off in the distance. Like, the whole sky was glowing [0]. I ended up driving out to try to find the source, and discovered it was a huge greenhouse/farm. Luckily not an extraterrestrial landing zone or so on ;) […

Same thing happened to me -- some greenhouses off highway one near Half Moon Bay

That could be the place that has https://www.ouroborosfarms.com/

Interesting aquaponics greenhouse. Worth a visit.

Re: What are the mysterious light sources on light pollution maps?

#102

Post by macqm »

I can't figure out one light pollution source in Poland in Sluchowo (54.77550N, 17.94972E). The map from 2015 shows some factory of sorts, but it disappears on the map from 2020, all you can see is an outline what it was. I really wonder what kind of place this was and why it emitted relatively a lot of light.

Re: What are the mysterious light sources on light pollution maps?

#103

Post by bjelkeman-again »

zsellera wrote: post #95

As someone working in the greenhouse lighting industry, I might have some insight on this: 1. there is an existing technology called energy screen/curtain, with the primary function of retaining heat, but can also reduce light pollution by an order of magnitude. 2. light that escapes is essentially money lost, however it alone does not justify the use of energy screens. 3. as long as farmers have access to (relativel…

Water use and nutrient recirculating can be lowered dramatically with aquaponics, even CO2 use can be lowered in some configurations. It comes with added complexity and capex, but should be financially sustainable.

Re: What are the mysterious light sources on light pollution maps?

#105

Post by aasasd »

macqm wrote: post #102

I can't figure out one light pollution source in Poland in Sluchowo (54.77550N, 17.94972E). The map from 2015 shows some factory of sorts, but it disappears on the map from 2020, all you can see is an outline what it was. I really wonder what kind of place this was and why it emitted relatively a lot of light.

OpenStreetMap doesn't have anything there, but Wikimapia has a ‘Shale Gas Drilling Rig’ nearby (‘Wiertnia Gazu Łupkowego’).

Re: What are the mysterious light sources on light pollution maps?

#106

Post by bjelkeman-again »

krick wrote: post #34
donkeyd wrote: post #10

Earlier quoted context omitted.

Only 90 minutes? For me it's at least 3 hours to get to Class 4 on the Bortle scale. Class 2 is probably more than 5 hours. Only alternative is the sea. I'm planning to take a trip to a Class 1 this summer, it'll be hard to find a place that dark that is reasonably reachable though.

Exactly, this almost sounds like humblebragging (I know it's not, but still...) I mean, in the whole EU you literally couldn't find a place with Class 1 at all , unless going far-far North into Finland national parks or Norwegian mountains. Makes you hate civilization.

According to Darksitefinder northern Sweden seems better. There are som great places to go up there in the winter that is well worth trying.

Re: What are the mysterious light sources on light pollution maps?

#107

Post by f1refly »

macqm wrote: post #102

I can't figure out one light pollution source in Poland in Sluchowo (54.77550N, 17.94972E). The map from 2015 shows some factory of sorts, but it disappears on the map from 2020, all you can see is an outline what it was. I really wonder what kind of place this was and why it emitted relatively a lot of light.

Most likely some kind of military operation. It could be a storage site, guarded 24/7 where light is important so the guards can see everything clearly.

Re: What are the mysterious light sources on light pollution maps?

#109

Post by macqm »

aasasd wrote: post #105
macqm wrote: post #102

I can't figure out one light pollution source in Poland in Sluchowo (54.77550N, 17.94972E). The map from 2015 shows some factory of sorts, but it disappears on the map from 2020, all you can see is an outline what it was. I really wonder what kind of place this was and why it emitted relatively a lot of light.

OpenStreetMap doesn't have anything there, but Wikimapia has a ‘Shale Gas Drilling Rig’ nearby (‘Wiertnia Gazu Łupkowego’).

Bingo you got it. https://infolupki.pgi.gov.pl/en/whats-drilled/news/3legs-res...
Post reply on HN