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The radius, r, of the small circle joining all points at latitude, φ is r = R cos φ where R is the radius of the sphere. That simplifies to r = cos φ if we assume a "unit sphere" (R = 1) for convenience. --------------------- A/D | r φ / | / | / | / |a / |x / |i ...


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It doesn't matter at what longitude you are. What matters is what latitude you are. Length of 1 degree of Longitude = cosine (latitude in decimal degrees) * length of degree (miles) at equator. Convert your latitude into decimal degrees ~ 37.26383 1 degree of Longitude = ~0.79863 * 69.172 = ~ 55.2428 miles More useful information from the about.com ...



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