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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 10 May 2020

    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/ndmrHx9N5Y

    6:20 AM - 10 May 2020
    • 2,135 Retweets
    • 12,723 Likes
    • La Esquina Somebody New 𝓡𝓮𝓫𝓮𝓬𝓪 𝓙𝓲𝓶𝓮𝓷𝓮𝔃 💘 Trieten Invariant mass venkat reddy grant stenger Gunda Upendar Rao Abbati
    107 replies 2,135 retweets 12,723 likes
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      2. the keto man‏ @numetaljacket 10 May 2020
        Replying to @nihilist_aditya @fermatslibrary

        the definition of radians (the angle at which the arc length equals the radius)

        1 reply 0 retweets 31 likes
      3. End of conversation
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      2. Guy Herbert‏ @guy_herbert 10 May 2020
        Replying to @fermatslibrary

        Is that why they counted in 60s as well? Lucky if not.

        3 replies 0 retweets 1 like
      3. Artemis‏ @Artemis_201 10 May 2020
        Replying to @guy_herbert @fermatslibrary

        60 was used because it is evenly divisible by so many numbers, which makes it a convenient way if measuring things. 1,2,3,4,5,6,10,15,30

        0 replies 1 retweet 5 likes
      4. End of conversation
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      2.  🦣matt 🏴‏ @malatesting 10 May 2020
        Replying to @tataygulaman @fermatslibrary

        they knew it was 365 (and some change) but 360 is a better number because it’s got more factors. like everybody else, they just periodically declared extra days/months to realign things

        3 replies 2 retweets 112 likes
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      2. Marco Piani‏ @Marco_Piani 10 May 2020
        Replying to @fermatslibrary

        Worth mentioning that 360 is 2*2*2*3*3*5, so it can be “split” conveniently in many ways (contrary to other potential approximations of the year’s duration in days)

        2 replies 0 retweets 26 likes
      3. Fish girl‏ @TunaAlert 10 May 2020
        Replying to @Marco_Piani @fermatslibrary

        360 is a highly composite number, meaning it's divisible by more numbers than any positive integer less than it. These tend to be the best numbers for groups of things, 12, 24 and 60 also happen to be highly composite. That's why I'm sad that we're using the decimal system.

        3 replies 1 retweet 36 likes
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