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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 May 10
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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/ndmrHx9N5Y

    6:20 AM - 10 May 2020
    • 2,306 Retweets
    • 13,562 Likes
    • slackmind Şahin 🌌 Hardik Upadhyay stephen emblem Vikilis Olaf Willocx ⚔️SANDEEP SINGH⚔️ 𝙲𝚘𝚗𝚛𝚊𝚍 𝙷𝚊𝚛𝚝-𝙱𝚛𝚘𝚘𝚔𝚎 🗳🔸 Gonca Aydın
    127 replies 2,306 retweets 13,562 likes
      1. New conversation
      2. jame⁷ ⟬⟭‏ @cipria_NO May 10
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        Replying to @fermatslibrary

        Well thank goodness it was the Sumerians and not the Egyptians, otherwise we would be using 365.

        2 replies 1 retweet 64 likes
      3. matt‏ @joaquin67 May 10
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        Replying to @cipria_NO @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 128 likes
      4. 2 more replies
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      2. Joseph T Noony‏ @JoeAgneya May 10
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        Replying to @fermatslibrary

        Where is the proof for 2400BC? It was the Vedic Indians who conceived the celestial wheel of 360 spokes/degrees & 720 half degrees. They had a 360 day sacrificial year. This is explicit in the Rig veda(3000-1800BCE). Modern trigonometry-'sine' & 'cosine'-also came from India.

        10 replies 142 retweets 462 likes
      3. tulasi dass‏ @tulasid0 May 10
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        Replying to @JoeAgneya @fermatslibrary

        sir, they will even say that vedic indians copied from sumerians. they are biased soldout eurocentric group. you cant expect truth from them. Asians should create their own intelligentsia to counter propangada by this group.

        4 replies 0 retweets 11 likes
      4. 2 more replies
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      2. Luis Batalha  🇵🇹 🇺🇸‏ @luismbat May 10
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        Replying to @fermatslibrary

        It's also useful because 360 has so many factors that provide a larger number of easily definable units: 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 36, 40, 45, 60, 72, 90, 120, and 180.

        4 replies 3 retweets 158 likes
      3. JimmyG‏ @divergingroads May 10
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        Replying to @luismbat @fermatslibrary

        And 360 is good for tracking the moon's cycles of 30-ish, and the moon was an important timepiece. 360 was multiple of base 60 which when having no modern number system was easy to divide things like wages for the individuals in a group or grain into smaller parcels.

        0 replies 0 retweets 10 likes
      4. End of conversation
      1. Susam Pal‏ @susam May 10
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        Replying to @fermatslibrary

        The fact that 360 is a highly composite number may have been a reason for defining a degree such that a full rotation is 360°. A highly composite number is a positive integer that has more divisors than any smaller positive integer. See https://oeis.org/A002182  for more details.

        0 replies 5 retweets 48 likes
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      2. Marco Piani‏ @Marco_Piani May 10
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        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 27 likes
      3. ∢ Acute angle ⦠‏ @TunaAlert May 10
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        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 34 likes
      4. 7 more replies
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      2. Vladimir Ilievski‏ @VladOsaurus May 10
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        Replying to @fermatslibrary

        But it feels somehow more natural. It is easier to remember that 90 is a right angle, rather than 1.5708 radians.

        2 replies 0 retweets 3 likes
      3. Jonathan Andrews  🏴󠁧󠁢󠁷󠁬󠁳󠁿 🇬🇧 🇮🇹 🍺‏ @Jonatha05469026 May 10
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        Replying to @VladOsaurus @fermatslibrary

        Quite right, at least in normal life, but in mathematics, it's far easier to work with radians. Radians are the natural way of describing angles

        1 reply 0 retweets 18 likes
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