the best The Cambridge Double Star Atlas by Bruce MacEvoy & Wil Tirion & James Mullaney 5VVF3ol1

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    The Cambridge Double Star Atlas is back It is the first and only atlas of physical double stars that can be viewed with amateur astronomical instruments. Completely rewritten this new edition explains the latest research into double stars and looks at the equipment techniques and opportunities that will enable you to discover observe and measure them. The target list has been completely revised and extended to 2500 binary or multiple systems. Each system is described with the most recent an