[AZ-Observing] Re: Geminids
- From: "Paul Lind" <pulind@xxxxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Tue, 11 Dec 2007 20:53:22 -0700
Paul,
Then are you not staying at Hovatter Norte for the Geminids on Thursday
night?
Paul
----- Original Message -----
From: "L Knauth" <Knauth@xxxxxxx>
To: <az-observing@xxxxxxxxxxxxx>
Sent: Tuesday, December 11, 2007 8:26 PM
Subject: [AZ-Observing] Re: Geminids
> An advantage to your "nap until moonset" approach is possibly that the sky
> tends to get a lot better several hours after sunset. At Hovatter Norte,
> we often note even on the clearest nights that everything below about 30
> degrees is decidedly less black than above after twilight and that this
> gradually descends down to the horizon as the evening progresses. By
> midnight, it can be really black all the way down if we aren't looking
> toward any kind of city. My own prejudice is that this is the skyglow
> generated by UV blasting the upper atmosphere all day. Toward midnight,
> ions lifted to higher energy states have pretty much cascaded down to
> lower states and quit giving off light. Anyone know if this is a
> reasonable explanation? I haven't looked into the official version of
> whether you can see skyglow. The observation is certainly not something we
> are imagining.
> BTW: If the predicted clearing trend continues, I am doing a one-nighter
> at Hovatter Norte Wednesday night.
>
> Paul Knauth
>
--
See message header for info on list archives or unsubscribing, and please
send personal replies to the author, not the list.
Other related posts:
