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 
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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
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Nothing to do with the fact that they counted in base 60 ?
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What if it was the other way around? What if they developed base 60 by observing this pattern in nature?
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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
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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.
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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)
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Cool ! (All the ejercises below does they mean something especial ?)
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So, the martians divided the circle into 687 degrees?
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There are 670 Martian days in a Martian year. Martians don’t use Earth days as a measure of time.
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