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Oi Abraham e boa tarde!
The best way to do it, I think, would be to get a
compass and an angle measuring device. You will need to set the altitude by
knowing your latitude, that will tell you how far up it needs to point. Second
with your compass, you need to pint it to true South not magnetic south. The map
to field deviation in São Paulo is probably about 10 deg so point the axis to
170 South. That should get you fairly close. I don't know how you can refine
it.
Sabia que no SP ha um clube chamada "CASP"
Clube Astrônomico do São Paulo? Os socios podem te ajudar
tambem.
Pode ve-lo aqui : http://groups.yahoo.com/group/C-A-S-P/messages
Sorry guys I couldn't resist writing a little
bit in Portuguese - there are not many people who speak it in
Australia.
Regards
Monte
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