How can I calculate the circumference of the Earth at
>different latitudes? Example: What would the distance around the Earth be
at 30 degrees latitude?
Charles, simple geometry. The radius from a vertical from pole to pole,
to the outside of the earth at the desired latitude is what you need to
figure it out. This radius is the full Earth radius times the cosine
of the latitude angle. Then, the circumference at that latitude is
2 times pi times that latitude radius.
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Update: June 2012