[AZ-Observing] Re: SQM readings

  • From: "Jack Jones" <Telescoper@xxxxxxx>
  • To: <az-observing@xxxxxxxxxxxxx>
  • Date: Mon, 19 Mar 2007 20:46:31 -0700

You have to become comfortable with spreading light over an area rather than a 
point source as a magnitude. You do this already when dealing with surface 
brightness. Astronomers, who have to quantify everything or they are not 
happy, picked the square arc-second (rather than say, a square arc-minute 
which would be spreading it kinda thin).


----- Original Message ----- 
From: "Ken Sikes" <KGSikes@xxxxxxx>
To: <az-observing@xxxxxxxxxxxxx>
Sent: Monday, March 19, 2007 8:27 PM
Subject: [AZ-Observing] Re: SQM readings

Another good site explaining magnitudes per square arc-second

Ken Sikes

----- Original Message ----- 
From: "Peter Argenziano" <pargenz@xxxxxxx>
To: <az-observing@xxxxxxxxxxxxx>
Sent: Monday, March 19, 2007 8:19 PM
Subject: [AZ-Observing] Re: SQM readings

Ken, a Sky Quality Meter measures the sky darkness in magnitudes per square
More info here on the manufacturers website:


----- Original Message ----- 
From: "Ken Reeves" <kreeves@xxxxxxxxx>
To: <az-observing@xxxxxxxxxxxxx>
Sent: Monday, March 19, 2007 8:08 PM
Subject: [AZ-Observing] Re: SQM readings

Pardon my ignorance, but what is an SQM and what is the scale of it?

Ken Reeves

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