Re: [APML] How far are light domes visible....

["Chris & Jennifer Cook" <ccjd@ix.netcom.com>]

Yeh, I have that book and have seen the image you are referring to.
For those of you into calculations, how far does one have to get away from a
large city(LA, Vegas, Phoenix) for the dome to totally disappear behind the
curvature of the earth?

Chris


==================
Chris Cook
Astronomical Photography
www.abmedia.com/astro


-----Original Message-----
From: Matt BenDaniel <matt@starmatt.com>
To: astro-photo@seds.org <astro-photo@seds.org>
Date: Friday, January 25, 2002 8:04 PM
Subject: Re: [APML] How far are light domes visible....


>In David Malin's book "A View of the Universe", he presents an image of the
sky at Siding Spring, Australia showing a light dome from Sydney, which is
355km (220 miles) away.
>
>At 06:15 PM 1/25/2002 -0800, Chris & Jennifer Cook wrote:
>>Well after a few people asked me if I could see the light dome of Blythe,
>>CA, from the Desert Center site, I sat down with a regional map and came
up
>>with the answer.  If you look at the image:
>>http://www.abmedia.com/astro/current/dcstartrails-east.html   I'm 99% sure
>>the orangish light dome is Phoenix, 180 miles away to the east.  Blythe is
>>the smaller greenish/white dome to the right of the Phoenix dome.  These
>>domes were not visible to the eye but are there, as the film saw them
during
>>a long exposure.
>>
>>I also figured out what was causing the small light dome to the north in
the
>>polar star trail shots, I finally realized its Las Vegas.  See:
>>http://www.abmedia.com/astro/current/dcstartrails-north.html
>>Again, looking at a map, there is absolutely nothing between the site and
>>Vegas which is 165 miles directly north.  Normally one would not see the
>>dome if there were trees or higher mountains but with a horizon that has
>>zero obstructions, it shows up.
>>
>>When all you have is empty, unpopulated relativly flat desert between you
>>and a large city, it can be seen for a long way.
>>
>>Chris
>>
>>
>>==================
>>Chris Cook
>>Astronomical Photography
>>www.abmedia.com/astro
>>
>>
>>
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>--
>Matt BenDaniel
>http://starmatt.com
>
>
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