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"This is the definitive book for those who are serious about this fascinating aspect of astronomy. It deals with equipment (you can start quite modestly with commercial or home-made instruments), observing methods from binoculars upward, CCD camera techniques, and finally advanc…
Double stars are the rule, rather than the exception: our solar system, having a single sun, is in the minority. Orbiting satellites, ground-based observatories and interferometers have all helped discover many hundreds of new pairs - but this has left enormous numbers of wide, …