Brian says that by all accounts the seeing is consistently poor at Sunglow. Wil, who has observed there more than anybod= y on this list, disagrees. Based on my limited data, I tend to side with Brian. I counted up the number of nights I have spent at Sunglow, which is = now 21. I think I've been clouded out five or six times. I can remember three of the clear nights in which I would say = the seeing is in line with or better than low-desert sites such as Vekol or Sentinel. On all of the others, I have been = limited in my 10-inch and 20-inch scopes to a magnification of less than 150x until the images become painful to look at.= Perhaps the poor seeing doesn't reveal itself as much in the smaller apertures or wide field astrophotos that Wil takes= Brian pointed correctly to the mechanism behind Sunglow's unstable air. The last thing you want is a 4000-foot rise imme= diately to your east. Even at Vekol, I notice a predictable seeing degradataion associated with an easterly breeze sever= al hours into the night. It's certainly worse in the foothills of high mountains, and that shows up in the eyepiece. I = hope Frank Kraljic has more to say about this, as he is even more finicky about seeing than I am. This says nothing about transparency or darkness, which are as good as it can be not only in the United States but on the= planet. Go to Outback Australia, and it won't be any darker than Sunglow at the zenith. And the transparency won't be = as good as Sunglow, since you won't find many places at 5000 feet, which is ideal for my tastes. What would be interesting is a survey of practical sites of southern Arizona in which the seeing was measured. Don't loo= k at me. Tom -------------------------------------------------------------------- mail2web - Check your email from the web at http://mail2web.com/ . --- This message is from the AZ-Observing mailing list. If you wish to be removed from this list, send E-mail to: AZ-Observing-request@xxxxxxxxxxxxx, with the subject: unsubscribe. The list's archive is at: //www.freelists.org/archives/az-observing This is a discussion list. Please send personal inquiries directly to the message author. In other words, do not use "reply" for personal messages. Thanks.