Skip to content
By using Twitter’s services you agree to our Cookies Use. We and our partners operate globally and use cookies, including for analytics, personalisation, and ads.

This is the legacy version of twitter.com. We will be shutting it down on June 1, 2020. Please switch to a supported browser, or disable the extension which masks your browser. You can see a list of supported browsers in our Help Center.

  • Home Home Home, current page.
  • About

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?

    New to Twitter?
    Sign up
fermatslibrary's profile
Fermat's Library
Fermat's Library
Fermat's Library
@fermatslibrary

Tweets

Fermat's Library

@fermatslibrary

A platform for illuminating academic papers. We publish an annotated paper every week. Our chrome extension for arXiv: https://fermatslibrary.com/librarian 

fermatslibrary.com
Joined September 2015

Tweets

  • © 2020 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Imprint
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list


    Under 100 characters, optional

    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    Fermat's Library‏ @fermatslibrary 9 Aug 2019
    • Report Tweet
    • Report NetzDG Violation

    Here's why the circle has 360 degrees: around 2400 B.C., the ancient Sumerians noticed the Sun's annual path across the sky was ~ 360 days. In order to track the Sun's motion, they decided to divide the circle in 360 degrees.pic.twitter.com/jY95E7Yxvy

    5:20 AM - 9 Aug 2019
    • 1,713 Retweets
    • 6,533 Likes
    • Aunti National Gorica Chase Konstantin Kushko Vaishnavi Íñigo Díaz de Bustamante Hatice Duman Luke Fowler no_curve
    59 replies 1,713 retweets 6,533 likes
      1. New conversation
      2. Julius Jääskeläinen‏ @JuliusJaas 9 Aug 2019
        • Report Tweet
        • Report NetzDG Violation
        Replying to @fermatslibrary

        I find it hard to believe this, such a big error would have been visible within a few years

        4 replies 0 retweets 57 likes
      3. Julius Jääskeläinen‏ @JuliusJaas 9 Aug 2019
        • Report Tweet
        • Report NetzDG Violation
        Replying to @JuliusJaas @fermatslibrary

        This explanation seems much more likely: that it was to do with the Mesopotamian base-60 number system and circle as a compond of 6 equilateral triangleshttps://www.popsci.com/scitech/article/2002-02/who-determined-circle-should-be-divided-360-degrees/ …

        2 replies 16 retweets 192 likes
      4. 2 more replies
      1. New conversation
      2. Edna‏ @balzacdiet 9 Aug 2019
        • Report Tweet
        • Report NetzDG Violation
        Replying to @fermatslibrary

        Does that mean they already knew the earth was revolving around the sun?

        1 reply 0 retweets 3 likes
      3. Sarita Salazar‏ @sarasalazar 9 Aug 2019
        • Report Tweet
        • Report NetzDG Violation
        Replying to @balzacdiet @fermatslibrary

        I believe not, only until ~250 bc Aristarco (Greek astronomer) proposed a Sun-centered universe. Right after that Eratostenes -another Greek- estimated the earth curvature by measuring the sun’ shadow.

        1 reply 0 retweets 9 likes
      4. 5 more replies
      1. Mick Freed‏ @Mick_the_Knife 9 Aug 2019
        • Report Tweet
        • Report NetzDG Violation
        Replying to @fermatslibrary

        Just think, if they'd done their measurements more accurately, we'd have circles with 365¼°, and trigonometry would be so much harder.

        1 reply 1 retweet 83 likes
        Thanks. Twitter will use this to make your timeline better. Undo
        Undo
      1. New conversation
      2. Hauke Wörpel‏ @HaukeWorpel 9 Aug 2019
        • Report Tweet
        • Report NetzDG Violation
        Replying to @amazigh_mohand @fermatslibrary

        and 120

        1 reply 0 retweets 26 likes
      3. burak‏ @burakdxb 9 Aug 2019
        • Report Tweet
        • Report NetzDG Violation
        Replying to @HaukeWorpel @amazigh_mohand @fermatslibrary

        And 360 😂

        3 replies 0 retweets 22 likes
      4. 1 more reply
      1. 𝐸𝓁𝓁𝒾𝑒 𝒹𝑜𝑒𝓈 𝒽𝑒𝓇 𝓉𝒽𝒾𝓃𝑔𝓈‏ @609Ellie 9 Aug 2019
        • Report Tweet
        • Report NetzDG Violation
        Replying to @fermatslibrary

        Never realised that the ° symbol is the way it is because it’s a circle.

        1 reply 0 retweets 20 likes
        Thanks. Twitter will use this to make your timeline better. Undo
        Undo
      1. New conversation
      2. Rakshati Armanarik (Pínākapani)‏ @DrakeFlegel 9 Aug 2019
        • Report Tweet
        • Report NetzDG Violation
        Replying to @fermatslibrary

        pic.twitter.com/5iMCJ2tdlm

        1 reply 2 retweets 12 likes
      3. Nanda Hind  🇮🇳‏ @aray00910 10 Aug 2019
        • Report Tweet
        • Report NetzDG Violation
        Replying to @DrakeFlegel @fermatslibrary

        😂😂

        0 replies 0 retweets 0 likes
      4. End of conversation

    Loading seems to be taking a while.

    Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

      Promoted Tweet

      false

      • © 2020 Twitter
      • About
      • Help Center
      • Terms
      • Privacy policy
      • Imprint
      • Cookies
      • Ads info