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earth's curvature, earth's curvature calculator, earth's curvature per mile, earth's curvature formula, earth's curvature and refraction, earth's curvature per square mile, earth's curvature and tilt effect, theory of earth's curvature, how high to see earth's curvature, equation for earth's curvature, what is earth's curvature, calculate earth's curvature, what is the earth's curvature per mile
