[AZ-Observing] Re: best seeing sites and times

  • From: "Frank Kraljic" <FJKraljic@xxxxxxx>
  • To: <az-observing@xxxxxxxxxxxxx>
  • Date: Sun, 14 Mar 2004 17:22:28 -0700

> Hi Bill,
> I goofed on the scale.  On the Pickering scale, seeing is 
> typically rides between a 6 and 8.  The scale I use, which is 
> close to Pickering, can be found at:  
> http://www.cmc.ec.gc.ca/cmc/htmls/seeing_e.html.  This site is 
> pretty similar if not the same as the clear sky clock many people 
> use.  I have found this seeing forecast to be pretty accurate, 
> and use their scale for comparison.  When it predicts bad seeing, 
> it usually is, and the same is usually true for good seeing.  
> However, I have not put this to the test with observers in 
> different locations observing at the same time, as conditions 
> vary with the local terrain such as you noted.
> I have a condo in Scottsdale, and observe from my balcony (second 
> story)--the nearest mountain is about 10 miles away.  I have 
> joked in the past the 10 feet of altitude is the source of good 
> seeing, and some believe that may actually be true, but I haven't 
> tested this either and am curious if there is any validity to the idea.
> Tonight, the seeing is suppose to improve in our area to a 4 on 
> their scale by midnight and will let everyone know if the 
> prediction holds true for this evening.

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