Quote:
trade in for a GPS and an inflatable doll....
The doll to keep you busy..the GPS so you don't get lost when you close your eyes using the doll.....
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I know Giu is kiddin', but seriously some days I wonder why I bother reading some of this stuff.
Try this link:
Examples
That will give you a start - but only a start.
Here's the home page:
Astrolabes
I'd also suggest a decent book on astronomy as well since it's use requires you have some basic understanding of the motion of stars, the sun and planets... (ok, well, sun and stars mostly).
But, what do I know....