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Hi David,
The links and info Merlin gave you may be very helpfull.
I would be happy to chat with you at Lostock (ru going ?) or the next time we meet at Kulnurra about this. Also happy to chat on the phone if you wish.
What I can tell you in advance however is that to undertake astrometric measurements of double stars, the moon, planets etc you need an accurate "tracking" mount. To do the job in textbook fashion it should really be an accurately polar aligned equatorial mount. A dob is no use here unfortunately. I know you are considering another scope and maybe this new found observing pursuit should be factored into your pending scope purchase ?
CS-John B
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