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Its called a heliostat.  I saw an amazing example in battery park  
city in lower manhattan.  They are building a new residential  
building that is U shaped with the opening of the U facing north.  So  
the courtyard would be quite dark and cold.  No problem, they dropped  
a massive heliostat (my impression is that it was a 20 foot  
*radius*on the top of a building to the north that will reflect  
sunlight into the courtyard.  When we saw it, we couldn't help but  
imagine them making the mirror a *little* convex, to help with  
tanning.   Anyway, as the man would have said: "google and you shall  
find:" http://www.egis.org/Helio_us.html

Eric Siegel
Executive VP
    Programs and Planning
NY Hall of Science
47-01 111th Street
Queens, NY 11368
www.nyscience.org

On Nov 9, 2005, at 10:35 PM, Mike Shanahan wrote:

> ISEN-ASTC-L is a service of the Association of Science-Technology  
> Centers
> Incorporated, a worldwide network of science museums and related  
> institutions.
> ********************************************************************** 
> *******
>
>
>
> We are trying to find a way to project the sun into a museum building
> and on to a prism to create a rainbow effect.  Does anyone have advice
> on what it takes to get a tracking device that would work year- 
> round to
> project the sun's light into a building?  We of course have telescopes
> that can be set up to do a similar job on a daily basis but this would
> be a more permanent installation and one that would, ideally, not
> require daily adjustment.
>
>
>
> I recall seeing a device at the space museum in Rio de Janeiro that
> projected the sun onto the museum floor...I should have taken more
> notes!
>
>
>
> Reply online or offline, if you would.
>
>
>
>
>
> Mike Shanahan
>
> Education Director
>
> Bishop Museum
>
> 1525 Bernice Street, Honolulu HI 96817
>
> Office: (808) 847-8235
>
> FAX: (808) 847-8250
>
> Cell/pager: (808) 386-1419
>
> www.bishopmuseum.org
>
>
>
>
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