Howard, thanks for the light pollution map. That is very useful. The readings
one can get with a sky quality meter, can be transformed into Bortle readings.
The thing one has to watch out for is to do the reading on a moonless night,
and not have a lot of clouds (that will reflect city lights and make the sky
brighter), and try to take the readings several hours after sunset when the sky
is darker. Also, some places like Superior turn most of their lights off after
9 pm which can affect Bortle readings. So to compare light pollution readings,
several parameters need to be considered to get consistent comparisons. Take
care, Sam
-----Original Message-----
From: Howard Moneta <hmoneta@xxxxxxxxx>
To: pasmembers <pasmembers@xxxxxxxxxxxxx>
Sent: Fri, Nov 25, 2016 11:57 am
Subject: [pasmembers] Light pollution map 2016
It is interesting to see when toggling 2014/2015/2016 that light pollution in
rural areas grew in past years then reduced in 2016. I wonder if the accuracy
is off in the 2016 measurement. Since the 0,25 - 0,40 reading is consistently
less all over the map in 2016, it might not mean much.
https://www.lightpollutionmap.info/#zoom=8&lat=3958151&lon=-12497799&layers=B0TFFFFF
Howard
