Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
· Get a Cloudy Nights T-Shirt · Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User

General Astronomy >> General Observing and Astronomy

Pages: 1 | 2 | (show all)
Brian Albin
Seeker


Reged: 08/22/06

Loc: Western Oregon
What is a White Zone?
      #5754660 - 03/24/13 06:18 PM

I see some observers mention being in an observation white zone, or grey zone. What does this mean?

Post Extras: Print Post   Remind Me!   Notify Moderator  
Scott in NCAdministrator
80mm Refractor Fanatic
*****

Reged: 03/05/05

Loc: NC
Re: What is a White Zone? new [Re: Brian Albin]
      #5754684 - 03/24/13 06:29 PM

Hi Brian, read this S&T article (scroll down to see the definitions of the different colored zones): link.

Post Extras: Print Post   Remind Me!   Notify Moderator  
jpcannavo
scholastic sledgehammer
*****

Reged: 02/21/05

Loc: Ex NYCer, Now in Denver CO!
Re: What is a White Zone? new [Re: Scott in NC]
      #5754788 - 03/24/13 07:28 PM

NYC (where I have the pleasure of residing!)

Post Extras: Print Post   Remind Me!   Notify Moderator  
Photobud
super member


Reged: 01/07/13

Re: What is a White Zone? new [Re: Scott in NC]
      #5754790 - 03/24/13 07:28 PM

Chicagoland is a white zone. You can drive without headlights at night and unfortunately is all too often done.

Post Extras: Print Post   Remind Me!   Notify Moderator  
buddyjesus
Carpal Tunnel
*****

Reged: 07/07/10

Loc: Davison, Michigan
Re: What is a White Zone? new [Re: Photobud]
      #5754951 - 03/24/13 08:57 PM

http://www.jshine.net/astronomy/dark_sky/

Post Extras: Print Post   Remind Me!   Notify Moderator  
Startraffic
professor emeritus
*****

Reged: 02/12/06

Loc: Lat. 39.143345, Long. -77.1748...
Re: What is a White Zone? new [Re: buddyjesus]
      #5755625 - 03/25/13 07:55 AM

Washington DC

Clear Dark Skies
John
39.138274 -77.168898


Post Extras: Print Post   Remind Me!   Notify Moderator  
Ebyl
super member


Reged: 07/04/12

Re: What is a White Zone? new [Re: Startraffic]
      #5755683 - 03/25/13 08:55 AM

Keep in mind the scale just stops at white, at least as far as I know. If you look at that map, you'll see plenty of relatively small metro areas, at least when compared to something like NYC, Chicago, LA, etc, that are white zones. Viewing from a white location in one of those smaller areas will be significantly better than in the middle of a huge city.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Achernar
Postmaster
*****

Reged: 02/25/06

Loc: Mobile, Alabama, USA
Re: What is a White Zone? new [Re: Brian Albin]
      #5755735 - 03/25/13 09:43 AM

This refers to the degree of light pollution affecting the area from where you are observing. A black zone site is free of any manmade light pollution at all, and very few land areas meet this rating. A white zone is the center of an metropolitan urban area lit up to the point where only the moon, bright planets and the brightest stars can be seen with the unaided eye. The colors in between represent everything in between. Generally speaking, a green to gray zone site allows for very good views of galaxies and nebulae. Most people can reach such a site in an hour's drive from home. Yellow and orange zone sites are not as dark, whereas red and white zone sites are what you will find in a city or suburbs. This system of rating how dark a site is does not take into account passing cars or your neigbor's annoying security lights, local sources of glare can be blocked with light screens, fences or other means to screen out glare from nearby lights.

Taras


Post Extras: Print Post   Remind Me!   Notify Moderator  
Startraffic
professor emeritus
*****

Reged: 02/12/06

Loc: Lat. 39.143345, Long. -77.1748...
Re: What is a White Zone? new [Re: Ebyl]
      #5755817 - 03/25/13 10:23 AM

Ebyl,
This is one of the reasons I'm adding the ability to do Solar to my gear. LP is so bad, there is NO Milky Way, anything dimmer than a Mag 5-6 is totally washed out & can only be found using LP filters, M31, M42 NADA. I've got 19 New coachlight style streetlights between 150-500ft of my Obs. None of which are on the County's Approved SL list, & the SL design plan was installed without approval. The developers response "The streetlights are in & are working fine. I'm not changing something that works just to make a couple of cry babies happy." This was said to the County Street Light Engineer & Me. The fight goes on but the development hasn't stopped. My Obs was in place 6 yrs ago & I,, along with the rest of my town were assured we wouldn't even know the difference. Then they started BLASTING, 150ft from my well, for 3 months.

Clear Dark Skies
Startraffic
39.138274 -77.168898


Post Extras: Print Post   Remind Me!   Notify Moderator  
Brian Albin
Seeker


Reged: 08/22/06

Loc: Western Oregon
Re: What is a White Zone? new [Re: Startraffic]
      #5756868 - 03/25/13 07:39 PM

Thanks, Achernar. That answered me.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Tora
super member


Reged: 10/09/09

Loc: Illinois
Re: What is a White Zone? new [Re: Startraffic]
      #5756870 - 03/25/13 07:40 PM

The white zone is for loading and unloading of passengers only, and there's no stopping in the red zone...

(Sorry - Couldn't resist...)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Mike B
Starstruck
*****

Reged: 04/06/05

Loc: shake, rattle, & roll, CA
Re: What is a White Zone? new [Re: Tora]
      #5756984 - 03/25/13 08:48 PM

Quote:

and there's no stopping in the red zone...




Not unless ya want the light-polution patrol writin' ya a ticket!


Post Extras: Print Post   Remind Me!   Notify Moderator  
Astrodj
professor emeritus
*****

Reged: 08/24/11

Loc: Missouri
Re: What is a White Zone? new [Re: Tora]
      #5757182 - 03/25/13 10:50 PM

Quote:

The white zone is for loading and unloading of passengers only, and there's no stopping in the red zone...

(Sorry - Couldn't resist...)







Post Extras: Print Post   Remind Me!   Notify Moderator  
Seldom
scholastic sledgehammer


Reged: 08/05/12

Loc: N of Cedar City Light Dome
Re: What is a White Zone? new [Re: Astrodj]
      #5757338 - 03/26/13 01:08 AM

Las Vegas

Post Extras: Print Post   Remind Me!   Notify Moderator  
hfjacinto
I think he's got it!
*****

Reged: 01/12/09

Loc: Land of clouds and LP
Re: What is a White Zone? new [Re: Seldom]
      #5757764 - 03/26/13 09:32 AM

Most of NJ is a white zone

Post Extras: Print Post   Remind Me!   Notify Moderator  
hm insulators
Post Laureate


Reged: 01/22/07

Re: What is a White Zone? new [Re: hfjacinto]
      #5757970 - 03/26/13 11:12 AM

The greater Los Angeles area.

North-central Phoenix.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Red Shift
super member


Reged: 11/09/11

Loc: Bloomfield, New Jersey, USA
Re: What is a White Zone? new [Re: hm insulators]
      #5758200 - 03/26/13 01:02 PM

Here are the White zones:




Other larger images can be found at:
http://visibleearth.nasa.gov/view.php?id=55167


Post Extras: Print Post   Remind Me!   Notify Moderator  
Starman81
Carpal Tunnel
*****

Reged: 03/06/08

Loc: Metro Detroit, MI, USA
Re: What is a White Zone? new [Re: Achernar]
      #5758295 - 03/26/13 01:56 PM

Quote:

Generally speaking, a green to gray zone site allows for very good views of galaxies and nebulae. Most people can reach such a site in an hour's drive from home.

Taras




I wish! More like 2+ hours on average for most people to sites that dark.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Lance1234
sage
*****

Reged: 11/01/12

Loc: SoCal
Re: What is a White Zone? new [Re: Tora]
      #5758371 - 03/26/13 02:44 PM

Quote:

The white zone is for loading and unloading of passengers only, and there's no stopping in the red zone...

(Sorry - Couldn't resist...)




Surely you can't be serious...


Post Extras: Print Post   Remind Me!   Notify Moderator  
Qwickdraw
Carpal Tunnel
*****

Reged: 03/03/12

Loc: Ann Arbor, MI
Re: What is a White Zone? new [Re: Lance1234]
      #5758454 - 03/26/13 03:26 PM

A place you dont want to live.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1 | 2 | (show all)


Extra information
7 registered and 11 anonymous users are browsing this forum.

Moderator:  cildarith, panhard, tecmage 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 1472

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics