(meteorobs) IMO limiting magnitude charts

[Steven Kolins]

On Aug 12, 2007, at 8:59 AM, Luc Bastiaens wrote:

> don't remember if or when the LM
> charts were changed :)

I hope someone is keeping up on these because it turns out the  
transparency of the sky has certainly changed over a period of  
decades - and add  city growth and changes in lighting technology and  
things would surely get complex to predict.

Here's one of the newer discovering of atmospheric transparency.   
http://en.wikipedia.org/wiki/Global_dimming

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Steven Kolins
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