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Math Help - [SOLVED] Measuring distances on Earth

  1. #1
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    [SOLVED] Measuring distances on Earth

    Hi,
    I know that r=Rcos alpha is used for finding the radius of a circle at say 30deg N. And R=6400km


    Is the angle alpha measured from:
    the side of the sphere;
    where the greenwich meridian and the equator intersect;
    from the true centre of the earth.

    ??
    Thanks...
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  2. #2
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    Quote Originally Posted by Neverquit View Post
    Hi,
    I know that r=Rcos alpha is used for finding the radius of a circle at say 30deg N. And R=6400km


    Is the angle alpha measured from:
    the side of the sphere;
    where the greenwich meridian and the equator intersect;
    from the true centre of the earth.

    ??
    Thanks...
    Hi Neverquit,

    The circle at 30^oN is a line of latitude.
    It can be measured from the side of the sphere (to the centre) or centre as shown
    in the attachment.
    Attached Thumbnails Attached Thumbnails [SOLVED] Measuring distances on Earth-earth.jpg  
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