""Properties of Double Stars: A Survey of Parallaxes and Orbits"" by Leendert Binnendijk is a comprehensive study of double stars, which are stars that appear as two distinct points of light when observed through a telescope. The book provides a detailed analysis of the properties of double stars, including their parallaxes (the apparent shift in position of a star due to the Earth's orbit around the Sun) and orbits.The author begins by discussing the history of double star observations, including the contributions of famous astronomers such as William Herschel and James Bradley. He then goes on to explain the different types of double stars and their physical properties, such as their masses and luminosities.The bulk of the book is devoted to a survey of double star parallaxes and orbits. The author presents data on hundreds of double stars, including their distances from Earth, orbital periods, and eccentricities. He also discusses the methods used to measure these properties, such as astrometry and spectroscopy.In addition to the scientific data, the book includes numerous diagrams and illustrations to help readers understand the complex orbital motions of double stars. The author also provides a glossary of technical terms and a bibliography for further reading.Overall, ""Properties of Double Stars: A Survey of Parallaxes and Orbits"" is an essential reference for anyone interested in the study of double stars and their properties. It is written in a clear and accessible style, making it suitable for both amateur and professional astronomers.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.

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