Feynman's Lost Lecture: The Motion of Planets Around the Sun

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Summary: Lucid explanation of Feynman's proof of the law of ellipses
Review: The book first walks you through the works of Copernicus, Galileo, Brahe and Kepler. Then it gives a brief account of Feynman's life and his work. Then, through numerous diagrams, the authors clearly explain Feynman's ingenious proof of the law of ellipses. Finally, the book presents Feynman's lecture "The Motion of Planets Around the Sun".

It is amazing how Feynman, starting on the lines of Newton, and then not being able to follow Newton's reasoning, devised a different but elegant proof of the law of ellipses.

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Summary: authors create a labour of love for Feynman
Review: This book is a labour of love by Judith and David Goodstein for their friend Richard Feynman. I really enjoyed the revelations of the human side of the great physicist, especially the 20 page reminiscene by David Goodstein (a fellow physicist at cal tech) and Feynman's sometimes gruff answers to questions after the lecture. A different view of the human side of Feynman than what you read in "Surely, you're joking". I found the technical side of the book even more rewarding (see next paragraph) but be warned: this is pretty intense geometry and logic - I have a hard time imagining anyone without at least a couple years of post secondary math or physics or engineering following all the arguments.

But if you have the background and patience, it's some pretty cool stuff. Like many folks, I learned planetary dynamics using calculus, not geometry, and so this was my first exposure to the elegant relationship between velocity diagrams and orbits. While Feynman's lecture is somewhat unorganized and not entirely clear, the book does a great job filling in the blanks. There are certainly some rough spots (way too much time on the initial simple properties of ellipses, the argument connecting Kepler's third law to the law of gravitation is not clear, and more) but anyone with sufficient background willing to invest a few hours will be able to get past these minor problems. I kind of like how the pace accelerates to a ridiculous level by the end, leaving you to pretty much work out all the hard details of Rutherford's law of scattering for yourself.

Listen to the lecture, scratch your head wondering "what the heck was that", then read the book and study the arguments, then listen again and feel enlightened.

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Summary: An Entertaining And Captivating Lecture
Review: This Review refers to the paperback edition of Feynman's Lost Lecture: The Motion of Planets Around the Sun with audio CD.

The title of Goodstein's book, Feynman's Lost Lecture, may be a bit misleading in terms of the overall content. The book is, in truth, mainly an explanation of the elliptic patterns performed by the planets, among other things, that an unpublished Feynman lecture originally referred to (although the lecture is included in text and on CD, the lecture is only a fraction of the overall book). Goodstein provides a geometrical means of explaining elliptical patterns that even a non-physicist will find easily comprehensible, especially considering the frequency of companion diagrams. The book also includes a rather unique introduction providing a brief biography of Feynman along with the author's personal experiences related to the well-known physicist. An unexpected, but greatly appreciated, addition is Feynman's original notes regarding his lecture contained in the back of the book.

Feynman's Lost Lecture details how to use geometric proofs to find answers to problems such as the speed of a planet when in motion around the sun and how to prove geometrically that an object is an ellipse. The author properly explains and demonstrates these concepts throughout the book via written and visual examples.

Goodstein presents the topics in such a fashion that the reader can easily try for himself\herself the idea portrayed. This is generally due to a generous selection of diagrams and exemplary situations, which properly convey the ideas that Goodstein presents (although it would probably be much more beneficial if more of the diagrams accompanied Feynman's actual lecture). The main text is also of a form easily understood and more than adequately conveys the topic that the author presents. However, the literary style is slightly lacking - in that it often becomes a bit informal in description and detail.

Overall, the literary shortcomings do not interfere with the author's ability to convey the topic and makes for a rather interesting read. Yet another above-par lecture accompanied by a surprisingly above-par explanation, Feynman's Lost Lecture: The Motion of Planets Around the Sun is more than worth it's price and should be a welcome addition to any reader's (both physicists and non-physicists alike) personal library.