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The Librarian Who Measured the Earth

by Kathryn Lasky

Other authors: Kevin Hawkes (Illustrator)

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8182421,011 (4.2)3
Describes the life and work of Eratosthenes, the Greek geographer and astronomer who accurately measured the circumference of the Earth.

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This amazing nonfiction children’s book tells the brief life story of librarian Eratosthenes and his discovery on the Earth’s circumference. Taken place in ancient Greek history, Eratosthenes is described to be a mind full of curiosity and wonder towards Earth as he makes further discoveries correlated from science and math. This book is such a wonderful and creative book that can be used with young readers to introduce introductory topics among math and science content areas. In math, this book can be used within an introductory lesson of circumference as this book goes into depth creatively about what circumference truly is. This book can also be used among science content lessons to go over the scientific method and the importance of formulating questions that can be tested using a scientifical experiment the way Eratosthenes tested his hypothesis on the circumference of the Earth. Additionally, author Kathryn Lasky provides fun facts throughout the book that can keep the reader engaged and amazed. I also like how this book correlated towards ancient Greek and Egyptian culture as it can be a great world history read when covering ancient history. ( )
  ingrisduran | Nov 5, 2021 |
Eratosthenes' determination and wonder-filled questions lead him to be able to measure the circumference of the Earth. I learned a lot from this book! It is filled with historical facts and small details about the time period that I had not known before. Towards the end, the math gets a little overbearing but I think that would make this great for older students who are using this as an introduction to a math or geography lesson. The book gives a full overview of Eratosthenes' life and was an inspiring read. ( )
  bosargetaylor | Sep 10, 2020 |
  CapitalCityPCS | Sep 20, 2019 |
Kathryn Lasky brings to life Eratosthenes of Cyrene by giving some, but not all, details of his life. She gives some background of him as a child and relates him to the children of today. This story is about Eratosthenes’ life and his journeys. After becoming the tutor to the son of King Ptolemy III of Egypt, he becomes a librarian. There he makes great discoveries from science to math, including measuring the circumference of the Earth. This colorful and inviting book is sure to keep readers interested. This is a good book to bring all areas of study together. [return][return]This book demonstrates to students that you do not need to be a mathematician to be able to do math. This biography gives students insight into the life of a famous, yet not well known, librarian, who not only makes mathematical discoveries, but scientific ones as well. Although this book is not a math book per se, it opens minds to connect all areas of study.[return][return]Biography[return]Reading Level: 5.8
  kristi_test_01 | Sep 12, 2019 |
Somewhat over inspirational biography of Eratosthenes. There are really nice illustrations of Eratosthenes technique for estimating the circumference of the earth, however. Also a new word, "betamist". A betamist is an especially trained walker, whose paces can be used to calculate distances. Alexander of Macedon kept a few, so he could map out the empire he conquered with reasonable accuracy. ( )
  themulhern | Feb 3, 2019 |
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Author nameRoleType of authorWork?Status
Kathryn Laskyprimary authorall editionscalculated
Hawkes, KevinIllustratorsecondary authorall editionsconfirmed
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To all children who dare to ask questions and continue to wonder --K. L.
To David, who is never satisfied --K. H.
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More than two thousand years ago, a very smart baby was born.
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Describes the life and work of Eratosthenes, the Greek geographer and astronomer who accurately measured the circumference of the Earth.

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