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fermatslibrary's profile
Fermat's Library
Fermat's Library
Fermat's Library
@fermatslibrary

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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

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    Fermat's Library‏ @fermatslibrary 28 Dec 2019
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    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/IIy8uoCC16

    5:30 AM - 28 Dec 2019
    • 2,060 Retweets
    • 8,851 Likes
    • Sharad Singh VHS dam dadi do #JusticeforGeorgeFloyd #BlackLivesMatter Citruz² Cygan Z Taborem b0i John Discord Mécréant de SSVT
    60 replies 2,060 retweets 8,851 likes
      1. New conversation
      2. Iain H Woodhouse  🌳伊恩‏ @fortiain 28 Dec 2019
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        Replying to @fermatslibrary @YvanDutil

        360 (as opposed to 365) is pretty handy if you don’t have a calculator ... (unlike 100) it divides neatly by 2,3,4,5,6,8,9,10,12,15,... you get the idea 😎

        1 reply 4 retweets 148 likes
      3. Ashwath Sampath (Ash)‏ @A_DifferentSpin 28 Dec 2019
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        Replying to @fortiain @fermatslibrary @YvanDutil

        That's incredible! Just for the sake of completeness, the factors of 360 are: 1,2,3,4,5,6,8,9,10,12,15,18,20,24,30,36,40,45,60,72,90,120,180,360

        1 reply 7 retweets 125 likes
      4. 3 more replies
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      2. Vincent Pantal 🍩ni‏ @panlepan 28 Dec 2019
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        Replying to @fermatslibrary

        Nothing to do with the fact that they counted in base 60 ?

        3 replies 2 retweets 42 likes
      3. Raphael Teixeira‏ @TxRaphael 28 Dec 2019
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        Replying to @panlepan @fermatslibrary

        What if it was the other way around? What if they developed base 60 by observing this pattern in nature?

        1 reply 1 retweet 9 likes
      4. 3 more replies
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      2. Vicnent – ∫∞‏ @Vicnent 28 Dec 2019
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        Replying to @fermatslibrary

        and not because 360 has ... 24 different factors ? :-) 1 | 2 | 3 | 4 | 5 | 6 | 8 | 9 | 10 | 12 | 15 | 18 | 20 | 24 | 30 | 36 | 40 | 45 | 60 | 72 | 90 | 120 | 180 | 360

        1 reply 3 retweets 79 likes
      3. Petar Donchev‏ @petar_donchev 28 Dec 2019
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        Replying to @Vicnent @fermatslibrary

        Vert likely both. 360 is a superabundant number, thus a very good choice - even though Sumerians did not have that advanced math, it is intuitive.

        1 reply 0 retweets 18 likes
      4. End of conversation
      1. New conversation
      2. .‏ @Expert_Says 28 Dec 2019
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        Replying to @fermatslibrary

        I think they know this 360=(1+1+1)×(11^(1+1)−1) 360= 2×(2×(2×2×22+2)) 360= 3^3 +333 360= 4+(((4+4)×44)+4) 360= (5/5+5)×(55+5) 360= 6×(66−6) 360=7+(((77−7)/7)+7×7×7) 360=8×(8×8−8)−88 360=(9+9)×(99/9+9)

        3 replies 49 retweets 310 likes
      3. Luciano‏ @Luciano42121905 28 Dec 2019
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        Replying to @Expert_Says @fermatslibrary

        Cool ! (All the ejercises below does they mean something especial ?)

        1 reply 0 retweets 1 like
      4. 4 more replies
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      2. ali mahdi‏ @alimahdi1982 28 Dec 2019
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        Replying to @fermatslibrary

        So, the martians divided the circle into 687 degrees?

        3 replies 2 retweets 46 likes
      3. Matthew Handy‏ @tweetprofmatt 28 Dec 2019
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        Replying to @alimahdi1982 @fermatslibrary

        There are 670 Martian days in a Martian year. Martians don’t use Earth days as a measure of time.

        1 reply 0 retweets 41 likes
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