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The Tau Manifesto: No, really, pi is wrong Paperback – June 28, 2010

by Michael Hartl (Author)
4.9 out of 5 stars (34)
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The Tau Manifesto is dedicated to one of the most important numbers in mathematics, perhaps the most important: the circle constant relating the circumference of a circle to its linear dimension. For millennia, the circle has been considered the most perfect of shapes, and the circle constant captures the geometry of the circle in a single number. Of course, the traditional choice for the circle constant is π (pi)—but, as mathematician Bob Palais notes in his delightful article “π Is Wrong!”, π is wrong. It’s time to set things right.
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  1. Print length
    55 pages
  2. Language
    English
  3. Publication date
    June 28, 2010
  4. Dimensions
    6 x 0.13 x 9 inches
  5. ISBN-13
    979-8506098348
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Product details

  • ASIN ‏ : ‎ B096CXMQ3W
  • Publisher ‏ : ‎ Independently published
  • Publication date ‏ : ‎ June 28, 2010
  • Language ‏ : ‎ English
  • Print length ‏ : ‎ 55 pages
  • ISBN-13 ‏ : ‎ 979-8506098348
  • Item Weight ‏ : ‎ 3.2 ounces
  • Dimensions ‏ : ‎ 6 x 0.13 x 9 inches
  • Best Sellers Rank: #1,477,581 in Books (See Top 100 in Books)
  • Customer Reviews:
    4.9 out of 5 stars (34)

About the author

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Michael Hartl

Michael Hartl

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Michael Hartl is a physicist and entrepreneur. He is the author of over a dozen books, including Learn Enough Python to Be Dangerous and the Ruby on Rails Tutorial, and was cofounder and principal author at Learn Enough (acquired 2022). He is also the founder of Tau Day and author of The Tau Manifesto. Previously, Michael taught theoretical and computational physics at the California Institute of Technology (Caltech), where he received a Lifetime Achievement Award for Excellence in Teaching and served as Caltech’s editor for The Feynman Lectures on Physics. He is a graduate of Harvard College, has a Ph.D. in Physics from Caltech, and is an alumnus of the Y Combinator entrepreneur program.

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Customer reviews

4.9 out of 5 stars
34 global ratings

Top reviews from the United States

  • Craig
    5.0 out of 5 stars ¡ τ > π !
    Reviewed in the United States on June 27, 2021
    Format: PaperbackVerified Purchase
    This book explains why a better CircleConstant is τ =c/r ≅ 6.283185307179586. Interestingly, the book also costs 6.28 U$D.
    8 people found this helpful
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  • Matthew I. Lehman
    5.0 out of 5 stars Everything was fine.
    Reviewed in the United States on July 24, 2021
    Format: PaperbackVerified Purchase
    Everything was fine.
    Helpful
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  • R. Romero
    5.0 out of 5 stars Trigonometry? Fixed.
    Reviewed in the United States on June 29, 2021
    Format: Paperback
    In math class, it always felt a bit dissatisfying that a circle was 2pi and that pi was only half a circle. This fixes that! Everything makes so much sense. I also like how it elegantly lines up with 360 degrees… a 12th of a circle is a 12th of tau is a 12th of 360 degrees and so on. Makes you understand why the Babylonians picked such a highly composite number for their circle. Maybe our base-10 system is also erroneous and could use some fixing too…. (Here’s to hoping for a sequel!)
    2 people found this helpful
    Helpful
     Report
  • Eric Armstrong
    5.0 out of 5 stars This is one to LOVE
    Reviewed in the United States on June 28, 2021
    Format: Paperback
    Short and sweet, as is typical with Michael's stellar prose.

    Since having been introduced to Tau by his work, I have
    actually USED tau on occasion. It's handy when woodworking,
    for example, to figure out the length of an arc. REALLY handy.

    That's something I NEVER did with PI. I learned it in school, but
    it never made enough sense to actually USE it. Tau is different.
    :__)
    One person found this helpful
    Helpful
     Report
  • J. Hoover Grud
    5.0 out of 5 stars It's a really tau-ll order to get me to like math.....
    Reviewed in the United States on July 1, 2021
    Format: Paperback
    Having read this book I am now tau-ler and no longer pi-eyed :)
    Helpful
     Report

Top reviews from other countries

  • Shane K
    5.0 out of 5 stars Lifesaver; Tau is superior than pie.
    Reviewed in the United Arab Emirates on July 15, 2022
    Format: PaperbackVerified Purchase
    Tau is truly the best. Learn the math and science problems from this very book. It will help at british curriculum Edexcel and BTEC science and maths. Very useful.
    Report
  • f(V,A,K)
    5.0 out of 5 stars Great mathematical topic to discuss with kids!
    Reviewed in the United Kingdom on February 19, 2024
    Format: PaperbackVerified Purchase
    I’ve celebrated both Pi Day (March 14) and Tau Day (June 28th) for years. But thinking logically, Tau makes a lot more sense; though changing from Pi to Tau would change the constants in the circular area, spherical volume equations, and binomial expansions for trigonometric ratios, but that is a small price to pay in terms of use of the basic circumference to radius equation. Personally, I blame the diameter for getting in the way and setting the value of Pi, before people settled on the radius.
    Customer image
    f(V,A,K)
    5.0 out of 5 stars
    Great mathematical topic to discuss with kids!

    Reviewed in the United Kingdom on February 19, 2024
    I’ve celebrated both Pi Day (March 14) and Tau Day (June 28th) for years. But thinking logically, Tau makes a lot more sense; though changing from Pi to Tau would change the constants in the circular area, spherical volume equations, and binomial expansions for trigonometric ratios, but that is a small price to pay in terms of use of the basic circumference to radius equation. Personally, I blame the diameter for getting in the way and setting the value of Pi, before people settled on the radius.
    Images in this review
    Customer image
    Report
  • A.
    5.0 out of 5 stars Worth twice its weight in pie
    Reviewed in the United Kingdom on July 12, 2021
    Format: PaperbackVerified Purchase
    Best addition to my sitting room table! Having a book to prove the argument is serious makes all the difference. Now I'll finally be able to make my imaginary guests come around to the same side. Truly revolutionary!
    Report
  • Amazon Customer
    4.0 out of 5 stars A bit maths heavy
    Reviewed in the United Kingdom on June 1, 2024
    Format: PaperbackVerified Purchase
    But I agree with the message
    Report
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