To clarify, the 'Hovatter site' or 'Hovatter Road site' sometimes referred to, is the Antenna site as described on the Clear Sky Clock page. For easy access to all Arizona sites, bookmark this link: http://cleardarksky.com/csk/prov/Arizona_clocks.html Jack Jones Public Events Coordinator Saguaro Astronomy Club Phoenix AZ Telescoper@xxxxxxx www.saguaroastro.org ----- Original Message ----- From: "Peter Argenziano" <pargenz@xxxxxxx> To: <az-observing@xxxxxxxxxxxxx> Sent: Sunday, January 14, 2007 11:41 AM Subject: [AZ-Observing] Re: Flat Iron last night Andrew, did Steve have a Sky Quality Meter? If so, it measures the brightness of the night sky in magnitudes per square arcsecond. I have one also, and will bring it out to Hovatter next weekend (weather permitting, naturally). To see an approximation between the SQM readings and the Bortle scale, refer to the color key for the light pollution maps available in a Clear Sky Clock. For example, refer to the Hovatter site's data below: http://cleardarksky.com/lp/SAC3AZlp.html?Mn=astrophysics Scroll down on the page and look at the third column in the table. This corresponds to the reading of the SQM. For comparative purposes, my suburban backyard has been measure no better than an 18.53, which clearly places it at the 'bad' end of the Bortle scale. This translates to a NELM of about 4.5. I'm curious to see how our favorite sites 'measure up'. Peter -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.