phil <[EMAIL PROTECTED]> writes:
> > Wow! How about a sextant?
> > Simple device really. And a great practical demonstration of trigonometry.
> >
> 
> Excellent idea, even found a few how to sites. We'll do it.
> Any others?

Sextants are difficult to build precisely (compared with quadrants)
and they are dangerous (if incorrectly used for sighting the sun).
Sighting stars can only be done at night, not so easy to demonstrate
during school hours.

Nonetheless, this page is pretty cool:

http://www.tecepe.com.br/nav/CDSextantProject.htm
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