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    Re: HR-1 working re-creation and new questions
    From: Robert Bernecky
    Date: 2013 Feb 7, 17:20 -0800

    surely we don't need a cannon (calculus) to shoot a fly. The Greeks would do it this way

    2 pi r = C of the earth
    add 1" to C and expect an increase in r of x
    2 pi (r+x) = C + 1"
    2 pi r + 2pi x = C + 1"

    the 2 pi r cancels the C and we have

    2 pi x = 1"
    x = 1"/2 pi

    x is roughly 7/44 of an inch using the simple approximation pi = 22/7

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