BeFreed
    Categories>Science>Longitude
    Longitude book cover

    Longitude by Dava Sobel Summary

    Longitude
    Dava Sobel
    3.99 (75312 Reviews)
    ScienceHistoryAdventure
    Overview
    Key Takeaways
    Author
    FAQs

    Overview of Longitude

    Before GPS, sailors died by the thousands. "Longitude" chronicles John Harrison's 40-year quest to solve navigation's deadliest puzzle, winning a king's ransom and changing history. Shortlisted for the Pulitzer Prize, this slim bestseller inspired a BBC series that captivated millions.

    Similar books to Longitude

    Explore Your Way of Learning
    Quick Summary9min

    Feel the book through the author's voice

    Deep Dive42min

    Turn knowledge into engaging, example-rich insights

    Flash Card10 insights

    Capture key ideas in a flash for fast learning

    Fun24min

    Enjoy the book in a fun and engaging way

    Best quote from Longitude

    “

    We suffer more in imagination than in reality.

    ”
    Explore Your Way of Learning
    Longitude isn't just a book — it's a masterclass in Science. To help you absorb its lessons in the way that works best for you, we offer five unique learning modes. Whether you're a deep thinker, a fast learner, or a story lover, there's a mode designed to fit your style.

    Quick Summary Mode - Read or listen to Longitude Summary in 9 Minutes

    Quick Summary
    Quick Summary
    Longitude Summary in 9 Minutes

    Break down key ideas from Longitude into bite-sized takeaways to understand how innovative teams create, collaborate, and grow.

    play
    00:00
    00:00
    Your browser does not support the audio element.

    Flash Card Mode - Top 10 Insights from Longitude in a Nutshell

    Flash Card
    Flash Card
    Top 10 Insights from Longitude in a Nutshell

    Distill Longitude into rapid-fire memory cues that highlight key principles of candor, teamwork, and creative resilience.

    Flash Mode Swiper

    Fun Mode - Longitude Lessons Told Through 24-Min Stories

    Fun
    Fun
    Longitude Lessons Told Through 24-Min Stories

    Experience Longitude through vivid storytelling that turns innovation lessons into moments you'll remember and apply.

    play
    00:00
    00:00
    Your browser does not support the audio element.

    Personalize Mode - Read or listen to Longitude Summary in 0 Minutes

    Personalize
    Personalize
    Experience Longitude in your own way.

    Ask anything, pick the voice, and co-create insights that truly resonate with you.

    Personalize Mode

    From Columbia University alumni built in San Francisco

    BeFreed Brings Together A Global Community Of 1,000,000 Curious Minds
    See more on how BeFreed is discussed across the web

    "Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."

    @Moemenn
    platform
    star
    star
    star
    star
    star

    "I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."

    @Chloe, Solo founder, LA
    platform
    comments
    12
    likes
    117

    "Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."

    @Raaaaaachelw
    platform
    star
    star
    star
    star
    star

    "Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."

    @Matt, YC alum
    platform
    comments
    12
    likes
    108

    "Reading used to feel like a chore. Now it’s just part of my lifestyle."

    @Erin, Investment Banking Associate , NYC
    platform
    comments
    254
    likes
    17

    "Feels effortless compared to reading. I’ve finished 6 books this month already."

    @djmikemoore
    platform
    star
    star
    star
    star
    star

    "BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."

    @Pitiful
    platform
    comments
    96
    likes
    4.5K

    "BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."

    @SofiaP
    platform
    star
    star
    star
    star
    star

    "BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"

    @Jaded_Falcon
    platform
    comments
    201
    thumbsUp
    16

    "It is great for me to learn something from the book without reading it."

    @OojasSalunke
    platform
    star
    star
    star
    star
    star

    "The themed book list podcasts help me connect ideas across authors—like a guided audio journey."

    @Leo, Law Student, UPenn
    platform
    comments
    37
    likes
    483

    "Makes me feel smarter every time before going to work"

    @Cashflowbubu
    platform
    star
    star
    star
    star
    star

    From Columbia University alumni built in San Francisco

    BeFreed Brings Together A Global Community Of 1,000,000 Curious Minds
    See more on how BeFreed is discussed across the web

    "Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."

    @Moemenn
    platform
    star
    star
    star
    star
    star

    "I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."

    @Chloe, Solo founder, LA
    platform
    comments
    12
    likes
    117

    "Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."

    @Raaaaaachelw
    platform
    star
    star
    star
    star
    star

    "Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."

    @Matt, YC alum
    platform
    comments
    12
    likes
    108

    "Reading used to feel like a chore. Now it’s just part of my lifestyle."

    @Erin, Investment Banking Associate , NYC
    platform
    comments
    254
    likes
    17

    "Feels effortless compared to reading. I’ve finished 6 books this month already."

    @djmikemoore
    platform
    star
    star
    star
    star
    star

    "BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."

    @Pitiful
    platform
    comments
    96
    likes
    4.5K

    "BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."

    @SofiaP
    platform
    star
    star
    star
    star
    star

    "BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"

    @Jaded_Falcon
    platform
    comments
    201
    thumbsUp
    16

    "It is great for me to learn something from the book without reading it."

    @OojasSalunke
    platform
    star
    star
    star
    star
    star

    "The themed book list podcasts help me connect ideas across authors—like a guided audio journey."

    @Leo, Law Student, UPenn
    platform
    comments
    37
    likes
    483

    "Makes me feel smarter every time before going to work"

    @Cashflowbubu
    platform
    star
    star
    star
    star
    star

    "Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."

    @Moemenn
    platform
    star
    star
    star
    star
    star

    "I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."

    @Chloe, Solo founder, LA
    platform
    comments
    12
    likes
    117

    "Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."

    @Raaaaaachelw
    platform
    star
    star
    star
    star
    star

    "Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."

    @Matt, YC alum
    platform
    comments
    12
    likes
    108

    "Reading used to feel like a chore. Now it’s just part of my lifestyle."

    @Erin, Investment Banking Associate , NYC
    platform
    comments
    254
    likes
    17

    "Feels effortless compared to reading. I’ve finished 6 books this month already."

    @djmikemoore
    platform
    star
    star
    star
    star
    star

    "BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."

    @Pitiful
    platform
    comments
    96
    likes
    4.5K

    "BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."

    @SofiaP
    platform
    star
    star
    star
    star
    star

    "BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"

    @Jaded_Falcon
    platform
    comments
    201
    thumbsUp
    16

    "It is great for me to learn something from the book without reading it."

    @OojasSalunke
    platform
    star
    star
    star
    star
    star

    "The themed book list podcasts help me connect ideas across authors—like a guided audio journey."

    @Leo, Law Student, UPenn
    platform
    comments
    37
    likes
    483

    "Makes me feel smarter every time before going to work"

    @Cashflowbubu
    platform
    star
    star
    star
    star
    star

    "Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."

    @Moemenn
    platform
    star
    star
    star
    star
    star

    "I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."

    @Chloe, Solo founder, LA
    platform
    comments
    12
    likes
    117

    "Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."

    @Raaaaaachelw
    platform
    star
    star
    star
    star
    star

    "Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."

    @Matt, YC alum
    platform
    comments
    12
    likes
    108

    "Reading used to feel like a chore. Now it’s just part of my lifestyle."

    @Erin, Investment Banking Associate , NYC
    platform
    comments
    254
    likes
    17

    "Feels effortless compared to reading. I’ve finished 6 books this month already."

    @djmikemoore
    platform
    star
    star
    star
    star
    star

    "BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."

    @Pitiful
    platform
    comments
    96
    likes
    4.5K

    "BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."

    @SofiaP
    platform
    star
    star
    star
    star
    star

    "BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"

    @Jaded_Falcon
    platform
    comments
    201
    thumbsUp
    16

    "It is great for me to learn something from the book without reading it."

    @OojasSalunke
    platform
    star
    star
    star
    star
    star

    "The themed book list podcasts help me connect ideas across authors—like a guided audio journey."

    @Leo, Law Student, UPenn
    platform
    comments
    37
    likes
    483

    "Makes me feel smarter every time before going to work"

    @Cashflowbubu
    platform
    star
    star
    star
    star
    star
    1.5K Ratings4.7
    Start your learning journey, now
    BeFreed App
    Download This Summary

    Get the Longitude summary as a free PDF or EPUB. Print it or read offline anytime.

    BeFreed

    Learn Anything, Personalized

    DiscordLinkedIn
    Featured book summaries
    Crucial ConversationsThe Perfect MarriageInto the WildNever Split the DifferenceAttachedGood to GreatSay Nothing
    Trending categories
    Self HelpCommunication SkillRelationshipMindfulnessPhilosophyInspirationProductivity
    Celebrities' reading list
    Elon MuskCharlie KirkBill GatesSteve JobsAndrew HubermanJoe RoganJordan Peterson
    Award winning collection
    Pulitzer PrizeNational Book AwardGoodreads Choice AwardsNobel Prize in LiteratureNew York TimesCaldecott MedalNebula Award
    Featured Topics
    ManagementAmerican HistoryWarTradingStoicismAnxietySex
    Best books by Year
    2025 Best Non Fiction Books2024 Best Non Fiction Books2023 Best Non Fiction Books
    Featured authors
    Chimamanda Ngozi AdichieGeorge OrwellO. J. SimpsonBarbara O'NeillWinston ChurchillCharlie Kirk
    BeFreed vs other apps
    BeFreed vs. Other Book Summary AppsBeFreed vs. ElevenReaderBeFreed vs. ReadwiseBeFreed vs. Anki
    Learning tools
    Knowledge VisualizerAI Podcast Generator
    Information
    About Usarrow
    Pricingarrow
    FAQarrow
    Blogarrow
    Careerarrow
    Partnershipsarrow
    Ambassador Programarrow
    Directoryarrow
    BeFreed
    Try now
    © 2026 BeFreed
    Term of UsePrivacy Policy
    BeFreed

    Learn Anything, Personalized

    DiscordLinkedIn
    Featured book summaries
    Crucial ConversationsThe Perfect MarriageInto the WildNever Split the DifferenceAttachedGood to GreatSay Nothing
    Trending categories
    Self HelpCommunication SkillRelationshipMindfulnessPhilosophyInspirationProductivity
    Celebrities' reading list
    Elon MuskCharlie KirkBill GatesSteve JobsAndrew HubermanJoe RoganJordan Peterson
    Award winning collection
    Pulitzer PrizeNational Book AwardGoodreads Choice AwardsNobel Prize in LiteratureNew York TimesCaldecott MedalNebula Award
    Featured Topics
    ManagementAmerican HistoryWarTradingStoicismAnxietySex
    Best books by Year
    2025 Best Non Fiction Books2024 Best Non Fiction Books2023 Best Non Fiction Books
    Learning tools
    Knowledge VisualizerAI Podcast Generator
    Featured authors
    Chimamanda Ngozi AdichieGeorge OrwellO. J. SimpsonBarbara O'NeillWinston ChurchillCharlie Kirk
    BeFreed vs other apps
    BeFreed vs. Other Book Summary AppsBeFreed vs. ElevenReaderBeFreed vs. ReadwiseBeFreed vs. Anki
    Information
    About Usarrow
    Pricingarrow
    FAQarrow
    Blogarrow
    Careerarrow
    Partnershipsarrow
    Ambassador Programarrow
    Directoryarrow
    BeFreed
    Try now
    © 2026 BeFreed
    Term of UsePrivacy Policy

    More Like This

    book cover
    Wide Wide Sea
    Hampton Sides
    A gripping account of Captain Cook's final voyage, exploring imperial ambitions, cultural clashes, and the explorer's tragic demise.
    book cover
    Salt to the Sea
    Ruta Sepetys
    Forgotten maritime tragedy reveals humanity amid war's darkest hours.
    book cover
    Origins
    Lewis Dartnell
    A captivating exploration of how Earth's geological forces have profoundly influenced human civilization, from evolution to modern politics.
    podcast cover
    The Templar LegacyLongitudeSea PowerVoodoo Histories
    23 sources
    Mapping Mysteries: Columbus to Humboldt
    Explore how Columbus's magnificent miscalculation changed history, the enigmatic connections between Templars and the New World, and how Humboldt's scientific approach revolutionized our understanding of exploration.
    book cover
    Sea power
    James Stavridis
    A naval admiral's compelling voyage through the world's oceans, exploring their historical and geopolitical significance in shaping global power.
    book cover
    Cod
    Mark Kurlansky
    A captivating exploration of how the humble cod shaped human history, economies, and cultures across the globe.
    podcast cover
    What Makes Love Last?Love's Blueprint: The Science of Building Lasting RelationshipsIntimacy and DesireThe Science of Fading Love: Why Relationships Die and Revive
    27 sources
    Long-Distance Love: The Surprising Science of Success
    Discover why long-distance relationships aren't doomed to fail and learn the research-backed strategies that help couples build stronger bonds across the miles.
    podcast cover
    source 1source 2source 3source 4
    6 sources
    Beyond Make Your Bed: Small Habits, Big Transformations
    Discover how Navy SEAL discipline, morning rituals, and tiny daily choices compound into extraordinary success. From cold showers to character building, learn the science behind habits that transform ordinary days into an exceptional life.

    Key Takeaways

    1

    The Invisible Grid That Changed the World

    play
    00:00
    00:00
    Your browser does not support the audio element.

    Imagine being stranded in the middle of the vast ocean with no way to determine your exact position. This was the reality for sailors for centuries, leading to countless shipwrecks and lost lives. While determining latitude (north-south position) was relatively simple-sailors could measure the height of the sun or North Star-longitude (east-west position) presented an entirely different challenge. The world is wrapped in these invisible lines that converge at the poles like segments of an orange. Unlike latitude, longitude has no natural starting point, and is fundamentally linked to time. Since Earth rotates 360 degrees in 24 hours, each hour represents 15 degrees of longitude. To know your longitude at sea, you needed to know what time it was at a reference point while also knowing your local time. This seems simple enough today, but on rolling ships in the 18th century, pendulum clocks couldn't maintain accuracy amid the pitch and roll of ocean voyages. Without accurate time, sailors were literally lost at sea, relying on educated guesswork-"dead reckoning"-with often deadly consequences. What's remarkable is how long this problem persisted and how its solution would eventually come not from established scientists but from a humble, self-taught clockmaker.

    2

    Blood and Treasure: The Cost of Navigational Ignorance

    3

    The Race for a Solution

    4

    The Clockmaker Who Changed the World

    5

    H-1 to H-4: The Evolution of Precision

    6

    Triumph and Betrayal

    7

    A Legacy That Circles the Globe