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You don't have the necessary military training (thelemmy.club)
submitted 5 months ago by to c/memes@hexbear.net
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[–] 27 points 5 months ago (19 children)

24 hr vs 12 hr format is the most pointless debate of all time

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  • [–] 18 points 5 months ago (14 children)

    π vs τ

    (π is correct btw)

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  • [–] 30 points 5 months ago* (last edited 5 months ago) (13 children)

    border-arc-quad-2border-arc-quad-1        border-diagonal-tl-br         border-arc-quad-2
    border-arc-quad-3border-arc-quad-4        border-diagonal-tr-bl         border-arc-quad-3

    peppino-square-up

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  • [–] 10 points 5 months ago (12 children)

    What's the area of a circle?

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  • [–] 27 points 5 months ago* (last edited 5 months ago) (11 children)

    phoenix-sweat It is πr^2^ or, equivalently, 1/2 τr^2^

    phoenix-think But wait since π is defined in terms of the diameter it should be 1/4 πD^2^ .

    phoenix-evidence In fact look at all these quadratic forms

    • distance fallen in a gravitational field: 1/2 gt^2^
    • energy of motion: 1/2 mv^2^
    • speed 1/2 at^2^
    • area of a circle 1/2 τr^2^

    phoenix-objection-1phoenix-objection-2 Because when you step up from the linear, one dimensional circumference, and integrate, then the antiderivative should have a 1/2 factor to account for the square when differentiating back. The fact that π cancels this factor, and hides it is to its detriment!

    phoenix-smug Read https://www.tauday.com/tau-manifesto again, specifically section 3. τ is how the circumference of a unit circle should be defined since we use the radius and never the diameter. Anything else is revisionism comrade, do better.

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  • [–] 14 points 5 months ago (1 child)

    I have never seen this before, but one of the courses I have to develop curriculum for includes high school level trigonometry, and I am pretty fucking convinced that for learners (especially with LDs in math), the τ circle constant is conceptually easier to understand. The page is absolutely correct that showing a new learner the special angles with τ is a much simpler point of entry than the special angles relative to π (Figures 8 and 10).

    Thanks for sharing!

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  • [–] 8 points 5 months ago

    A class full of young tauists sounds sick and I fully agree that it's conceptually much easier (simply by virtue of being the trivial definition). In application however pi still reigns supreme, so if they use calculators for instance there will be a constant translation effort (remember to multiply with 2, or was it halve it??) that could be frustrating.

    You have the coolest job ever though much props rat-salute

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  • [–] 13 points 5 months ago (3 children)

    24 hr is better but I'm forced to use 12 hr because everyone around me doesn't know 24 hr and the only people who do are military chuds.

    Similar reason why I use mm/dd/yy for dates even though dd/mm/yy makes way more sense to me

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  • [–] 8 points 5 months ago (2 children)

    I'm sorry but how do people not know? You just add numbers from 12. It's not that hard for most people, surely?

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  • [–] 5 points 5 months ago

    You would think, but in my experience you try to use 24 hr time and people suddenly can't comprehend numbers larger than 12, and its not worth explaining every time that 17:00 = 5pm. I just do the adjustment myself since 9/10 times they'll ask for clarification anyway

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  • [–] 3 points 5 months ago*

    Mental arithmetic is in fact not universal. People who grew up on 24h time have the benefit of rote memorizing the relationship between 17 and 5 from childhood.

    Like, the fact that 9:00 (or 21:00) points leftward / “west” with the hour-hand is something that kids just have to learn and remember. At first it is a lot of mental overhead. But I bet it was immediate for you when you read this, no?

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