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Math Help - Spherical Circle Circumference

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    Spherical Circle Circumference

    Suppose I travel r distance away from the north pole and then made a spherical circle at this distance (essentially a line of latitude). How do I figure out the circumference of this spherical circle?
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by Janu42 View Post
    Suppose I travel r distance away from the north pole and then made a spherical circle at this distance (essentially a line of latitude). How do I figure out the circumference of this spherical circle?
    Draw a diagram:

    Spherical Circle Circumference-gash.png

    \rho is the radius to be used in calculation of the circumference, and:

    \sin(r/R)=\rho/R
    CB
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