From the reviews: "The moon that wasn't makes the reader aware of how the idea of a Venusian satellite retained its attractiveness not only in science but also in society ... . well-produced, clearly organized, and supported by useful illustrations ... and an extensive bibliography. ... Helge Kragh must be congratulated for writing a solid historical study that portrays lesser known, second- or even third-rate astronomical researches and for offering ... new case studies for philosophers of science to ponder." (Jaroslaw Wlodarczyk, Journal for the History of Astronomy, November, 2010) "This book is an account of certain peculiar telescopic observations from the 1640s through the 1760s, and of the interpretations of them during this early period and later. ... Kragh's endeavor in this book is to give an account of the Venus-moon affair that is as complete as possible. His examination of the literature has been extensive ... . He provides an extensive bibliography, identifying the many primary sources which he has consulted. He includes biographical sketches of the 23 chief characters in his story." (Curtis Wilson, Aestimatio: Critical Reviews in the History of Science, Issue 8, 2011) "The Moon That Wasn't comprehensively reviews the literature relating to the search. ... Kragh rigorously supports his narrative by extensive footnotes and references, and includes biographical summaries for two dozen of the prominent individuals associated with the controversy. ... this volume contains extensive material of interest to historians ... . Summing Up ... . Professional and academic historians of science; general readers." (D. E. Hogg, Choice, Vol. 46 (9), May, 2009)

• A moon or not? A century of confusion.- From climax to anticlimax.- Contemporary analysis and criticism.- A spurious but persistent satellite.- Closure: the discussion of the 1880s.- Conclusion, and a note on the satellites of Uranus.

From the reviews: "The moon that wasn't makes the reader aware of how the idea of a Venusian satellite retained its attractiveness not only in science but also in society ... . well-produced, clearly organized, and supported by useful illustrations ... and an extensive bibliography. ... Helge Kragh must be congratulated for writing a solid historical study that portrays lesser known, second- or even third-rate astronomical researches and for offering ... new case studies for philosophers of science to ponder." (Jaroslaw Wlodarczyk, Journal for the History of Astronomy, November, 2010) "This book is an account of certain peculiar telescopic observations from the 1640s through the 1760s, and of the interpretations of them during this early period and later. ... Kragh's endeavor in this book is to give an account of the Venus-moon affair that is as complete as possible. His examination of the literature has been extensive ... . He provides an extensive bibliography, identifying the many primary sources which he has consulted. He includes biographical sketches of the 23 chief characters in his story." (Curtis Wilson, Aestimatio: Critical Reviews in the History of Science, Issue 8, 2011) "The Moon That Wasn't comprehensively reviews the literature relating to the search. ... Kragh rigorously supports his narrative by extensive footnotes and references, and includes biographical summaries for two dozen of the prominent individuals associated with the controversy. ... this volume contains extensive material of interest to historians ... . Summing Up ... . Professional and academic historians of science; general readers." (D. E. Hogg, Choice, Vol. 46 (9), May, 2009)

• A moon or not? A century of confusion.- From climax to anticlimax.- Contemporary analysis and criticism.- A spurious but persistent satellite.- Closure: the discussion of the 1880s.- Conclusion, and a note on the satellites of Uranus.

From the reviews: "The moon that wasn't makes the reader aware of how the idea of a Venusian satellite retained its attractiveness not only in science but also in society ... . well-produced, clearly organized, and supported by useful illustrations ... and an extensive bibliography. ... Helge Kragh must be congratulated for writing a solid historical study that portrays lesser known, second- or even third-rate astronomical researches and for offering ... new case studies for philosophers of science to ponder." (Jaroslaw Wlodarczyk, Journal for the History of Astronomy, November, 2010) "This book is an account of certain peculiar telescopic observations from the 1640s through the 1760s, and of the interpretations of them during this early period and later. ... Kragh's endeavor in this book is to give an account of the Venus-moon affair that is as complete as possible. His examination of the literature has been extensive ... . He provides an extensive bibliography, identifying the many primary sources which he has consulted. He includes biographical sketches of the 23 chief characters in his story." (Curtis Wilson, Aestimatio: Critical Reviews in the History of Science, Issue 8, 2011) "The Moon That Wasn't comprehensively reviews the literature relating to the search. ... Kragh rigorously supports his narrative by extensive footnotes and references, and includes biographical summaries for two dozen of the prominent individuals associated with the controversy. ... this volume contains extensive material of interest to historians ... . Summing Up ... . Professional and academic historians of science; general readers." (D. E. Hogg, Choice, Vol. 46 (9), May, 2009)

• A moon or not? A century of confusion.- From climax to anticlimax.- Contemporary analysis and criticism.- A spurious but persistent satellite.- Closure: the discussion of the 1880s.- Conclusion, and a note on the satellites of Uranus.